Zone guardian MAI: add optional station_x,station_y= keys
New artwork for experimental ToD schedule
Demote all music_track::resolve() output to the info log level and clarify origin

Some of these error messages can seem duplicate in practice (if a track
can't be found, the playlist manager will complain again) or unfitting
(not all music tracks have to be in Ogg Vorbis format, or have
appropriate comments), hence they are more fitting for the info level
rather than the error level.
Healer Support MAI: make [filter] work correctly when aggression=0

Previously, all healers were excluded from attacks when aggression=0
was set, not only those specified in [filter].
Micro AIs: minor grammar fixes
Updated GUI1 mplobby background
Used correct image paths for default toggle button's disabled state