Changes and Fixes:
- Re-organized and fixed the code in the Asset Manager to prevent a cascade of problems when an asset failed to load properly
- Fixed some bugs in the Asset Manager for loading mods (found that adding mods of existing items were not updating the values correctly)
- Fixed a game crashing bug with characters (including the Player) checking for road tiles in the dungeon
- Fixed spell affects not aligning with larger enemies
- Fixed the mouse not working for the dungeon entrance/exit menus