Fixed diseases becoming unexpirable after trying to change channels or entering the Cash Shop.
Fixed Holy Symbol acting oddly in solo scenario.
Adjusted Summon Sack lv. 9, that would try to spawn mobs with inexistent id on the field.
Implemented AmoriaPQ. Fixed an issue with ItemIdSortHandler where empty
vectors given to the sorting module would cause an exception thrown,
wiping players inventory items. Thanks to Vcoc, revamped shop data for
GMShop (shop id 1337). Mount quest for explorers now uses event script.
Made NPCs now work properly on multiworld system. Solved multiple issues
regarding Player Shops not giving back items properly when owner exits.
Added restriction on changing channels at FM rooms, preventing shop
owner entering Cash Shop.
