 Version 6.15.5

* added note "Media files can only be imported after the DB" on combo import dialog
* fixed VideoMode dialog not being initialized and selection not shown
* revamped video player in Compose
	* switching between full screen and window modes only needs rotating the phone
* reduced heading font size from 28 to 24, and title font size from 22 to 18
* some dialogs are converted to Compose
* removed some unused layout files
