Update of EGLplus

- Added new functions to EGLInitializer.
- Added AttributeList.
- Added the SurfaceAttrib enumeration.
- Added the VGColorspace and VGAlphaFormat enumerations.
- Added the MultisampleResolve and RenderBuffer enumerations.
- Added the SwapBehavior enumeration.
- Added the TextureFormat and TextureTarget enumerations.
- Added Surface.