Enhancements

• Support alphaCutoff in prez pass and shadow map pass.

• App3D#loadModel and App3D#createMaterial add textureConvertToPOT property in the config.

• application.create add autoRender config.

• application.create add methods config. And these methods can be called outside using app.methods.xxxx.

• Add App3D#render method.

• Add App3D#height and App3D#width

• Vector3 builtin values like Vector3.ZERO will always create a new value.

Bug Fixes

• Fix image based lighting wrong when roughness is near to 1.

• Fix lighting bug in deferred rendering.

• Fix GBuffer#dispose does not work bug.

• Use blank texture when texture value is not renderable or is null. Remove the warnings.