+ API: add GetAudioDeviceInfo()
+ Performance: avoid loading multiple copies of track icon/media item background/info images
+ Undo: avoid repeatedly trying to reload track/item images after initial failure
+ Undo: avoid unnecessary reload of track panel images
+ Undo: fix loss of item background images [t=211437]
# Keyboard also ignore unmodified overrides in IDE windows
# Keyboard: ignore search filtering in global hotkey override list
