Still need to find out what I want to do with Body Slam, Swords Dance, and Thunder Wave. Slam/SD are on the Sevii Islands, and TWave is on an existing NPC who usually gives Self-Destruct.
Could possibly refactor the item receiving text.
* Update sign to bg_event #289
* Rename warp to warp_event
* Replace object to object_event
* Move warp macro parameter from warp x, y, id, map to warp_event x, y, map, id