Added code to scan mods directory
Created Mod class
Started rewriting loaders to use ZIP or dirs
Updated loaders to use new API
Updated ResourceManager with new API
Created foundation for ZippedResourceManager
Finished ZippedResourceManager
Completed changes to Engine class
Loader works, but not when in JAR
Made JAR loading not immediately crash
Fixed JAR resource loading
Merge remote-tracking branch 'origin/development'