Remove an unused TAG
Remove outdated or unnecessary TODOs
Playlist button polish

Playlist row buttons now have transparent backgrounds, and the ugly text
button has been replaced by an image button.
Replace default episode icons with rss image
Set episode logos in the playlist
Rework playlist row layout

This commit vastly simplifies the playlist row layout, most layout
atrocities have been removed.
Set player buttons to transparent background
Set player webview to fill parent height

The thin slice of empty webview when no episode is selected looks
strange (an empty white box is also somewhat less than ideal, but it
seems somewhat improved).
Convert player header do sane layout