Fix case of "OverlayUnwatched.png" directory

The "ListItem.Overlay" will return the value "OverlayUnwatched.png" for
an unwatched item, NOT "OverlayUnWatched.png". On a case sensitive file
system the unwatched overlays will not be shown

See:
https://github.com/xbmc/xbmc/blob/master/xbmc/guilib/GUIListItem.cpp#L207
Merge pull request #60 from EvanPurkhiser/fixup/case-sensitive-unwatched-overlay

Fix case of "OverlayUnwatched.png" directory
Added jpn.png
Fixed flags grouplist width
Optimized custom item settings code
Alle home, movie, tvshow, music and application tiles now customizable
Removed double condition
Fixed loading indicator not hiding if container actually empty

Needs latest randomandlastitems version (only on github at the moment)
to work properly with empty playlists
Fixed music tile
Added new pvr navigation menu + several layout updates
Fixed home screen custom items
Changed volume label from db to %
Fixed wrong condition
Added end time to channels osd
Removed open/close animation for now playing information
Minor update for now/next layout
Reverted volume label back to dB, keeps in line with osd audio settings
Updated settings radio button, spin control and slider images
Changed fade background behind dialogs
Slightly updated guide background to fit new fade background