Now freeing background/wallpaper image on disabling or changing
Bugfix #24 - fixed range check errors when scanning large numbers of roms

THHFindfile previously had property TotalSpace changed from LongInt to Int64, fixing the problem.
Fixed this in the zip, incremented version number and documented the change in its txt. Need to remember to DELETE the link to 1.3.0 on SF QP Project Page when updating this for release