This adds gym scaling for every leader, plus Koichi of the Fighting Dojo.
Me and Ema decided to give Koichi scaling, as he is a gym leader in everything but class. I will likely give Yujirou the same treatment once he's all set up.
The parties have not been set up, assuming Martha is working on them.
An important note: space is somewhat limited on trainers now, so the leaders will need implementing incrementally. You will most likely have to remove unnecessary trainers to make this work.
* 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