Remove PlayerView from Budgie

Note this now means Budgie is incapable of playing media.
Remove TESTING, use BudgieMediaView by default
Use osd style scrollbars for iconview
Visually polish the media view, add non-functioning switch buttons
db: Add support to search by mime type
view: Add Albums, Songs, and Videos buttons

These are mutual using a radio group, and currently don't do a lot.
view: Fix padding for track scrolled window
db: Allow search_field use with MEDIA_QUERY_MIME
view: Enable switching between Albums, Songs & Videos
Sort tracks alphabetically
view: Show count label for total number of media items (songs, videos)
view: Display current album information
view: Enable kinetic scrolling

Kinetic scrolling allows touch screen users to flick using their finger,
instead of attempting to use the scrollbars.

Note: This is in no way an attempt to be mobile or tablet friendly.
Let's not have this conversation. Ever. It's because I have a Thinkpad
with a touchscreen, and I want this. <Explained />
view: Ensure we escape displayed text (album info)
Add BudgieMediaLabel skeleton

Instead of using a GtkLabel to represent tracks, etc, within
BudgieMediaView, we'll use a specialised class that can also store
a MediaInfo, represent the relevant information, and be queried
to enable playback with minimal fuss.

We'll also be able to do some nice rendering of the play status,
making use of 'dim-label', etc.
view: Use new BudgieMediaLabel

This required a few changes, and will require more to come. Namely we
will no longer be able to free our current selection until a new
selection is made, which requires that BudgieMediaLabel free's its
own MediaInfo.
label: Use dim-label when not playing

This added a budgie_media_label_set_playing function, as well as a new
"playing" property for BudgieMediaLabel. The default is 'false', which
will render the label in a greyed out style.
Only clean up our BudgieDB results when we're done with them.
view: Emit media-selected signal when user selects a track (or video)
window: Basic support to play tracks

Currently we can only play the selected track, there is no *next*
track or previous. This will be added soon.