Merge commit 'ec58178695' into scripting

Conflicts:
	src/p_enemy.cpp
	src/p_enemy.h
	wadsrc/static/actors/constants.txt

(Scripting branch update part 1)

src/thingdef/thingdef_data.cpp

@@ -323,6 +323,7 @@ static FFlagDef InventoryFlags[] =
 	DEFINE_FLAG(IF, NOSCREENFLASH, AInventory, ItemFlags),
 	DEFINE_FLAG(IF, TOSSED, AInventory, ItemFlags),
 	DEFINE_FLAG(IF, ALWAYSRESPAWN, AInventory, ItemFlags),
+	DEFINE_FLAG(IF, TRANSFER, AInventory, ItemFlags),
 
 	DEFINE_DEPRECATED_FLAG(PICKUPFLASH),
 	DEFINE_DEPRECATED_FLAG(INTERHUBSTRIP),};