Added 'unload' to MediaManager (to stop playing video, for example)
Made volume knob/keys disable for ImageManager via 'has_volume' attribute
Added QStackedWidget for managing the different widgets. FINALLY.
Missed an 'unload' part. :(
Moved Text & Speed from Toolbar to Statusbar
Fixed Filetypes button not working till you change images or folders
Added Shift modifier to Volume & Speed changing & made +/- work with or without shift
Misc bugs:

    - Made vidyas seek back to beginning when loading
    - Tweaked speed changing with video
    - Fixed YET ANOTHER bug with the file dropping

Fuck me, eventually I'm going to get a handle on this not sucking at git thing.
Added basic seeking to videos