Major Lighting commit

[ZeunO8]

• Light Provider now sets up LightParams lParams
• Material Provider now sets up MaterialParams mParams
• Phong Lighting code moved to PhongLighting Provider
• Partially implement Physically Based Lighting Provider PBL(F0) function works, now for IBL(Lr, F0)
• Implement HDRI support
• Implement SkyBox support
• Demonstrate two separate working SkyBoxes in tests/ECS.cpp
• updates to Shader headers
  • can now set a variety of pipeline properties
• Framebuffers that are used more than once in a single frame no longer clear every bind (only on first bind)
• Provider ability to add GLSLBindings
• Provider can be a CPU buffer or a GPU buffer or NoBuffer
• DrawListManager now expects a DrawTuple, not vector, inline with SubMesh system
• Fix BufferGroup resize logging
• Move BlendState to its' own header
• verify_format_support()
• STB_Image_Loader now checks format support before creating image (supports N channel textures)

Change-Id: I9a6d56c70b4562cb2bc644b10f21313679499944