Fixed heli crashes spawning loot

* Changed lootType to itemType because lootType doesn't exist in the class 'HeliCrash.'
* Changed HeliCrashWEST And HeliCrashEAST to just HeliCrash because EAST/WEST didn't exist in config.cpp.
* Made the list of spawning items customizable within this script instead of editing config.cpp.
* Some of the comments MAY break the script; though this is just speculation. (Had bad experiences before).