* Updates script and demo to version 1.4 *
Ok, all fixed. I made a rather amateur mistake when making this. I used a hash in Game_Temp to store sprite data, including the icons. I used Game_Temp simply because it does not get saved, since Bitmaps cannot be saved. That was rather stupid of me, I didn't need to store the icons at all, I can just use string and load them when needed with RPG::Cache using that.
I ended up moving @proximity_data to Game_Map so that it gets saved with and loaded with the game and no more "undefined" errors. Old save files you may try to use will be corrupted, so erase them if you plan on using the new version of the script.