Changes history

Added KHR_materials_transmission extension support.
Added KHR_materials_volume extension support.
Added KHR_materials_ior extension support.
Added KHR_materials_specular extension support.
Added KHR_materials_iridescence extension support.
Added KHR_materials_emissive_strength extension support.
Added optional TransmissionSource renderer to SceneManager for scene refraction effect.
Added shader parser in order to split PBR shader into several files for better maintainability.
Added HDR/RGBE subformat support
Added USHORT and UBYTE support for bone weights
Fix PBR shader: Ambient occlusion texture is now applied to IBL only instead of all lights.
Added Mirror specular effect (dynamic reflections).
Added cascade shadow map.
Changed Skybox implementation using screen quad instead of literal box (fixing artifacts at far distance)
Added Skybox LoD capability (see SceneSkybox.lodBias).
Added Skybox alpha support.

[BREAKING CHANGE] upgrade to libGDX 1.9.11, you can't use older libGDX with this version.
[BREAKING CHANGE] MeshPlus class has been removed since libGDX now supports 64k vertices meshes. If you directly used MeshPlus in your code, you can now use Mesh class instead.
[BREAKING CHANGE] Fog density is now controlled by fog color alpha. Make sure to have fog color alpha at 1.0 in your code to keep previous behavior.
[BREAKING CHANGE] Tangent are automatically computed when necessary: when normal map is used and tangent attribute is missing.
Meshes with integer indices are now partially supported, vertices are split into 64k chunks.
Added LINES and POINTS support.
BaseColorFactor is now optional.
Mesh without normal is rendered as unlit.
Shadows no longer impacts other directional lights.
Fix light contribution when using shadows. Directional light was slightly dimmed for no reason.
Manual gamma correction is now configurable for PBRShaderProvider.
Added SkyBox color space conversion options.

Initial release.

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