Hardware Skinning Support

- Supports GL, D3D9 & D3D11
- Extends vertex formats & shadergen to support blend indices and weights
- Adds basic support for using 4x3 matrices for shader constants
- Supports software fallback

Engine/source/gfx/gfxEnums.h

@@ -48,6 +48,7 @@ enum GFXBufferType
                    ///< allowed.
       GFXBufferTypeVolatile, ///< Volatile vertex or index buffers are meant for vertices or indices that are essentially
                    ///< only used once.  They can be resized without any performance penalty.
+
       GFXBufferTypeImmutable, ///< Immutable buffers must specify the data when creating the buffer. Cannot be modified.
 
       GFXBufferType_COUNT ///< Number of buffer types.
@@ -581,7 +582,9 @@ enum GFXShaderConstType
    GFXSCT_Float4, 
    // Matrices
    GFXSCT_Float2x2, 
-   GFXSCT_Float3x3, 
+   GFXSCT_Float3x3,
+   GFXSCT_Float3x4,
+   GFXSCT_Float4x3,
    GFXSCT_Float4x4, 
    // Scalar
    GFXSCT_Int, 
@@ -621,6 +624,9 @@ enum GFXDeclType
    /// @see GFXVertexColor
    GFXDeclType_Color,
 
+   /// Four-component, packed, unsigned bytes ranged 0-255
+   GFXDeclType_UByte4,
+
    /// The count of total GFXDeclTypes.
    GFXDeclType_COUNT,
 };