0027853: Visualization, OpenGl_Texture - optimize sequential upload of texture image

0027853: Visualization, OpenGl_Texture - optimize sequential upload of texture image

Graphic3d_TextureRoot - added methods Revision() and UpdateRevision()
for marking updates in texture data source.
OpenGl_AspectFace handles Graphic3d_TextureRoot::Revision() changes.
OpenGl_Texture::Init() now patches already allocated texture image when possible.

Graphic3d_Texture2D - added methods HasMipMaps()/SetMipMaps()
for configuring MipMap usage (as alternative to sub-classing).