Initial implementation of context menus for tracks
Prettifying the context menu a bit
Adding track enqueueing to the context menu
Adding dequeue support to the context menu
Fixing enqueue support
Adding flipping when the context menu is selected past 75% of the horizontal space
Adding a sub-context menu for displaying static playlists
Adding add-to-playlist functionality for the context menu
Adding a context menu button at the right side of each track
Adding remove track from playlist support
Fixes #4
Merge branch 'f_trackContextMenu' into develop