MRG: Merged rfc-25-OpenGL_remote_desktop into develop.

Modules/Visualization/Ice/include/otbGlImageActor.h

Modules/Visualization/Ice/include/otbImageSettings.h

Modules/Visualization/Ice/include/otbStandardShader.h

Modules/Visualization/Ice/src/CMakeLists.txt

Modules/Visualization/Ice/src/otbGlImageActor.cxx

Modules/Visualization/Ice/src/otbImageSettings.cxx

Modules/Visualization/Ice/src/otbStandardShader.cxx

Modules/Visualization/IceViewer/src/otbIceViewer.cxx