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Makes this consistent with all other delegates using that style.

This is needed due to the changes in Kirigami.CardListView that badly
affected our timeline view, and it's not feasible to support both variants.

This allows much easier testing of various scenarios without having to
have the corresponding bookings in the real app.

This fixes color glitches due to recent Theme-related changes.

No actual content yet.

Transfers aren't actually added to the timeline yet though.

Most of the logic on which actions to show is now in there, and supported
via the timeline delegate controller. This makes things consistent between
the timeline delegates and the details pages. It also enables access to
more details in the place delegate, so we can now show departure
information with the correct times.

This ensures we are always using the batch id for batch operations, rather
than a random one of the batch, which isn't guaranteed to work. With this
live data access for multi-traveler batches should work correctly too.

On Android the Unicode characters give us two problems:
- switching from the color to the monochrome text variant doesn't work,
  and the color variants look quite ugly
- with Qt 5.11 the colored characters are randomly misaligned vertically

Instead, we use the Kirigami icon coloring magic for this to work with
different color schemes.

Prepares this for multi-traveler support.

i18n() is a lot more strict than qsTr() regarding what argument values it
accepts, so we need to be more careful with missing values there.

Since timezones matter for us (we want local times at the destination, not
times in our current timezone), we can't pass date/time values through QML,
as the timezone gets lost in the conversion to JS Date. So we need to do
the property read as part as the formatting function.

This is where locale-aware address formatting and map/navigation actions
go, to be shared for all reservation delegates.

Boarding passes are available on a second page now, as far as we have one
for a given reservation.