Multiview shaders.
Refactor Frustum management
Rewrite shared shadow map
cull mask should respect stereo
Stereo savegame screencap
LocalMap refactoring
use the vertex buffer hint instead of the display list patch to enable/disable display lists
Character preview fixes
With this PR we test out osg's shader define system for a somewhat harmless feature. As we can see, our code becomes more concise and efficient in this case. Most importantly, we no longer create unneeded vertex shader objects.
