Removed light prepass rendering support, as it has implementation difficulties under OpenGL and is often unsatisfactory in performance and specular lighting quality.
Removed the shader subdirectories.
Added option to specify whether single-channel images are to be interpreted as luminance or alpha, when loading into a texture.
Tweaked NinjaSnowWar difficulty.
Moved CreateObject from Object to Context.
Made EventHandler & AnimationState RefCounted to simplify memory management.
Fixed deletion of object, if no shared pointer to it existed previously, and it sent an event.
Fixed threading issue with objects' static type names. Now they are defined inside OBJECTTYPESTATIC macro as well.
Fixed Engine crash when running without the script system.