Ogre Rendering: Overhaul on the Tundra shadow system to a new CSM based technique. Includes code from the open source OgreCascadedShadows project. Updates all rex shaders to use this and OgreMaterialAsset has been updated to verify the new shadow textures. New EC_OgreShadowSetup so that each scene can have their own shadow settings that get applied during runtime. These affect both Ogre settings and modifies shader parameters on the fly.
Merge remote-tracking branch 'origin/admino_tundra' into admino_tundra