GameScript: commented out unused declaration of ChangeCurrentScript

currently uses ChangeAIScript
GameScript::DropInventoryEX: work on the target's inventory not the Senders

fixes rock traps in iwd2 ar4100 (41prlev2.baf), monk stripping in the
monastery tests and more
also send trigger_clicked for doors and containers

but only for normal access, since it is used also with traps in iwd2 and
would prevent their disarming

example: iwd2 ar4100 10 doors with 41pdoori.baf and rock piles with traps

fixes not being able to get the Aurilite Holy Symbol