3.7.1 update, backend cleanup, blacklist feature

This update adds ammos added with Streets expansion, does a LOT of backend code cleanup, and adds a blacklisted item type feature.

Any spawn points containing one or more items with parent ids present in the config.json spawnpoint_item_type_blacklist array will be skipped when loose loot is edited. This is to hopefully keep the mod from overwriting spawn points like Customs giving tree, various marked rooms, etc. that can spawn many item types and not JUST ammo.