MusicMod_Volume_210_v3: updated new option description
MusicMod_Volume_210_v3: WIP support for launching Glance on exit - currently doesn't work
MusicMod_Volume_210_v3: fixed window_stack_pop_all call
Added/updated option descriptions

;@ format (partially described in Notifications_ChangeHidingTimeout_200_v1)
is intended to be used by site interface.
Format:

;@option_name ["val" if option is not a checkbox, and maybe some math]
; Description
; Other description lones
;;

Description is all lines starting with "; " following ";@" line.
It ends with either /;[^ ]/ or empty line or anything other than "; ".