Implementation of sRGB image support. Overhauls the linearization setup to utilize the sRGB image types, as well as refactors the use of ColorF and ColorI to be properly internally consistent. ColorIs are used only for front-facing/editing/UI settings, and ColorFs, now renamed to LinearColorF to reduce confusion of purpose, are used for color info in the engine itself. This avoids confusing and expensive conversions back and forth between types and avoids botches with linearity. Majority work done by @rextimmy

Engine/source/gfx/gfxCubemap.h

@@ -47,6 +47,10 @@ protected:
    /// Sets the cubemap file path.
    void _setPath( const String &path ) { mPath = path; }
 
+   /// Get Z up face index of the cubemap. DDS files will be stored Y up
+   U32 _zUpFaceIndex(const U32 index);
+
+   U32 mMipMapLevels;
 public:
 
    /// Create a static cubemap from a list of 6 face textures.
@@ -74,6 +78,9 @@ public:
    // GFXResource interface
    /// The resource should put a description of itself (number of vertices, size/width of texture, etc.) in buffer
    virtual const String describeSelf() const;
+
+   /// Get the number of mip maps
+   const U32 getMipMapLevels() const { return mMipMapLevels; }
 };