Exposed StaticModelGroup to script. Ported HugeObjectCount example group mode switching to script versions.


git-svn-id: http://urho3d.googlecode.com/svn/trunk@2631 3bd170d8-ddcf-f82c-f583-7a401ccf5608
Unify material used in spawned objects in script versions of PhysicsStressTest.


git-svn-id: http://urho3d.googlecode.com/svn/trunk@2632 3bd170d8-ddcf-f82c-f583-7a401ccf5608