Merge branch 'feature_music_dialog' into develop
src: added graphical layout for sound control widget
src: added method stubs + minor stuff
src: mediaplayer factory
src: stubs for media control
src: added listener for dialog, rename package
src/xml: update dialog gui to display filepath
src: moved media handling to new class
misc: cleanup
src: added sound controller functions
misc: cleanup
src: scroll testing stuff
xml: made scrollable
src: removed obselet imports
xml: added layout for landscape orientation
misc: correct spelling
misc: cleanup
src: added stubs for database access
scr: rename
src: added functions to restart player