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This allows to open ics files from file managers and other applications

The incidence editor now edits a copy if the incidence ptr, meaning changes to the incidence aren't apparent until applied

Make week view all day header auto-adjust height to incidences and enable manual change of this view's height

* Port to Kirigami.ScrollablePage
* Add MouseArea in the background

Clicking outside an incidence with an open incidence now closes the drawer, 'deselecting' the incidence

This commit makes Kalendar's settings window more consistent with
other KDE apps.

This commit makes the settings window more consistent with the
settings windows in other KDE applications.

Also fix an annoyance that when Kalendar's window was maximized
the settings window would be huge.