PostProcessing: Add support for anaglyph stereoscopy mode.
VertexShaderManager: Add stereoscopy options to swap the left and right eye.
OGL: Add Top-and-Bottom stereoscopy mode.
ProgramShaderCache: Don't call glAttachShader if no geometry shader was compiled.
OGL: Also redefine glFramebufferTexture on OpenGL ES.
TextureCache: Fix invalid cast.
VideoConfigDiag: Update descriptions of stereoscopy settings.