0032093: Visualization, TKOpenGl - loading texture in BGR format fails in OpenGL ES

0032093: Visualization, TKOpenGl - loading texture in BGR format fails in OpenGL ES

Graphic3d_TextureRoot::convertToCompatible() - fixed handling of
Image_Format_BGR and Image_Format_BGRA formats.

OpenGl_Texture - added error message for unsupported pixel format;
error messages have been extended by resource id.
OpenGl_Texture::InitCubeMap() now does not release cubemap
on mipmaps generation failure.

Image_PixMap::ImageFormatToString() - added method returning name of pixel format.