Added option to use playlist for bg-music.
Added back-function to CGraphics.cs
Added (empty) jukebox-screen.
Merge branch 'develop' into bg-music

Conflicts:
	Vocaluxe/Base/CBackgroundMusic.cs
	Vocaluxe/Base/CGraphics.cs
	Vocaluxe/Screens/CPopupScreenPlayerControl.cs
Fixed conflicts
Some work on jukebox-screen...
Merge branch 'develop' of github.com:Flamefire/Vocaluxe into bg-music
More work on jukebox-screen...
Change timer.
Merge branch 'release-0.3' of github.com:flokuep/Vocaluxe into bg-music

Conflicts:
	Vocaluxe/Base/CBackgroundMusic.cs
	Vocaluxe/Screens/CPopupScreenPlayerControl.cs
Fix merge-errors.
Added some internal option to playlist-element to make it more flexible.
Added Random-Option to BG-Music.
Fix video in repeat-mode.
Added functions to buttons in jukebox-screen.
Merge branch 'bg-music' of github.com:flokuep/Vocaluxe into release-0.3
Fix bug in name-selection.