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The name of the active calendar is displayed as the header of the global drawer - both on desktop and mobile.

Date picker has been improved; in specific:
- We ensure that the pop up does not crop any calendar information
- Pop up margins are properly displayed
- Month-year text is spaced correctly

After having added an attendee to an event, the users can now edit the participation status of an attendee. E.g., they may mark some attendee(s) as optional. This feature has been added in terms of a pop-up editor, triggered by the "edit" action available in the list of the event attendees.

On month view, when trying to delete a task or event -in the list of cards- a confirmation inline message will be displayed. This way the users will be protected from unintentional deletions.

Event and task editor pages have been revamped. In specific:
- Reminders list has been moved to a separate tab
- Scheduling info (e.g. start, end date time) is displayed on the top part of each editor page
- Most common info between event and tasks has been included in the Details tab

KPeople module has been added to the flatpak manifest to fix the flatpak build

Basic attendee management features have been added to calendar events:
- Show attendee emails on event cards
- Add new attendee(s)
- Delete existing attendee(s) from an event
- Event cancellation
For attendee management to work, the active calendar should be an external ical file and the calendar owner info (name and email) should not be empty. The calendar owner will be set as the event organizer. Email notifications to attendees are not natively supported by Calindori. Nevertheless, if the external calendar file is synchronized with an external provider (e.g. Nextcloud) via vdirsyncer, attendee(s) will be informed by email whenever needed, e.g., when added to an event, when the event details are changed, in case the event is canceled etc. Moreover, the contacts found on the running system can be added as event attendees, using the KPeople abstraction layer, as long as a plugin-based source does exist (e.g. kpeoplevcard).

In case of conflict in i18n, keep the version of the branch "ours"
To resolve a particular conflict, "git checkout --ours path/to/file.desktop"

In case of conflict in i18n, keep the version of the branch "ours"
To resolve a particular conflict, "git checkout --ours path/to/file.desktop"

When the description text of an incidence is quite long, the text should wrap accordingly in order to fit into parent event/todo card.

Whenever a task or event is going to be deleted, display an inline message into the footer of the page, asking for confirmation in order to proceed

When the users select 12:00 PM, do not display 00:00

Use a single place to store card data shared between Event and Todo cards

Add event and task editor shared code into a shared editor component

When scheduling a repeating event started in the past, the present date should be taken into account instead of the date of the first repeating instance.

Up till now, users could import a calendar file to the application. In essence, this action consisted of a calendar file to be copied to the local data location of Calindori and a calendar entity to be created, based on that file. This functionality was limiting users to use different calendars for each imported set of calendar data. With this commit, users can import data -tasks and events- from a calendar file to the active calendar. If they need the data to be imported into a separate calendar, they can just create a new one before importing.

Closes !48

On desktop, the global drawer was hiding the inline message about calendar data import. This commit addresses this issue.

Adding an inline message to the footer of a not-loaded-yet page causes erroneous
positioning of the inline message. Instead, the inline message is added
to the application window footer.

Now that calindori handles direct opening of files, add this feature to
the desktop file

When loading the application, no inline message should be visible. Make it visible only when a message arrives from the calendar controller.

Now that CalendarController has been implemented, there is no need of maintaining separate event and todo controllers

Calindori can now directly open calendar files or urls given as arguments. If the file or url given contains either todos or events, the users are notified that tasks or events are going to be imported. If confirmed, tasks/events are imported into the active calendar.

Power devil wake-up backend may have not been fully initialized when calindac
starts. With this commit the powerdevil service is monitored: if it is
up and running and it offers wake-up scheduling (Plasma >= 5.20),
calindac makes use of it, otherwise it uses a fallback, timer-based
approach.

In case of conflict in i18n, keep the version of the branch "ours"
To resolve a particular conflict, "git checkout --ours path/to/file.desktop"

In case of conflict in i18n, keep the version of the branch "ours"
To resolve a particular conflict, "git checkout --ours path/to/file.desktop"

DBus interface files are only useful when the dbus API is public API and
some 3rd-party bits are supposed to use it. This is simply in-app IPC so
it is not useful for 3rdparty

There is no need to base the clock element on tool button since both
its content and display has been customized.

The month grid of tool buttons has been substituted with a grid of
rectangles and mouse areas. This should improve the loading performance.

Starting with Qt 5.15 onFoo propoerties in Connections are deprecated.

Here the two properties resulting in warnings are fixed. Most other
warnings are in kirigami.2.

Fixes: #8

Fix the following C++20 deprecation warning by explicitly capturing
`this` by value:

```sh
../calindac/alarmnotification.cpp: In lambda function:
../calindac/alarmnotification.cpp:19:72: warning: implicit capture of ‘this’ via ‘[=]’ is deprecated in C++20 [-Wdeprecated]
   19 |     connect(this, &AlarmNotification::suspend, m_notification_handler, [ = ]() {
      |                                                                        ^
```

Short version: fix pedantic warnings by setting C++20

Long version:

In `recurrenceperiodmodel.cpp` designated initializers are used. When
compiling with `-Wpedantic` The errors like the following are printed:

```sh
../src/recurrenceperiodmodel.cpp: In member function ‘void ReccurencePeriodModel::initialize()’:
../src/recurrenceperiodmodel.cpp:25:10: warning: C++ designated initializers only available with ‘-std=c++2a’ or ‘-std=gnu++2a’ [-Wpedantic]
   25 |         {.periodType = Recurrence::rNone, .periodTypeDesc = periodDecription(Recurrence::rNone)},
      |          ^
```

To fix this set the required C++ version to C++20.

`Q_PROPERTY` is a macro that does not need the trailing `;`. When
enabling `-Wpedantic` warnings errors like the following are printed:

```sh
In file included from ../src/recurrenceperiodmodel.cpp:7:
../src/recurrenceperiodmodel.h:21:55: warning: extra ‘;’ [-Wpedantic]
   21 |     Q_PROPERTY(ushort noRepeat READ noRepeat CONSTANT);
      |                                                       ^
      |                                                       -
```

When navigating between months via vertical swipes, in particular on low
power devices and when the Plasma style is active, the month view
freezes #7. With this commit, a progress indicator is displayed when the
month view is loading.

When explicitly setting the global drawer width, the global drawer does
not open on small screens