d3d11 shadow fixes
Merge branch 'gles2_d3d11' of https://github.com/attilaz/horde3d-x into gles2_d3d11
d3d11 texture3d support
put calcTextureSize into common egRendererBase (implementation is not platform specific)
refactored utTexture/egTexture (conversion is in egTexture now. to avoid memory allocation per surface)
added ktx file support(not yet tested)