Fix Server
Enable hiding the Server QR-Code Popup
Fix categories not showing on start
Fix NPE with few songs in category
Fix missing songs in categories
Unify language of songs
Don't show old preview song in category view
Extract CVideoPlayer.cs
Rename covers to match correct name and remove them from style file
Change values of xml argument to xPath only to make it more consistent
Merge branch 'develop' of github.com:Flamefire/Vocaluxe into sound-player

Conflicts:
	VocaluxeLib/Menu/SongMenu/CSongMenuFramework.cs