[NotificationNowPlaying] disable overlay button for musicplaylist if
player has no audio
[settings] adds controls to change settings level (fixes #5)

This adds two new buttons into the media menu. One for changing the new
settings level and the secord to reset the current settings category.
[cosmetics] fix indent for all xml files
[kiatoast] removes unneeded background texture and correct position
[livetv] move hidden action buttons out of screen (fixes #4)
[keyboard] keyboard and numeric pad tweaks
[keyboard] fix missing texture images
[NotificationCenter] adds a back button
[NotificationNowPlaying] adds new play/pause icon
[fix] hide "now playing" while infodialog or busydialog is visible
[slider] adjust size of slider control
[osd] adds a new video information osd