Vertex buffer is now only updated if both heightmap and normals have changed.
Fixed a bug where deferred geometry was rendered as terrain type.
(re)added code for excluding specular factor in DeferredLightning.fx for terrain.

Signed-off-by: Markus Tillman <reetopps6@hotmail.com>
Merge branch 'master' of https://github.com/Malow/NDYGFX
d

Signed-off-by: Markus Tillman <reetopps6@hotmail.com>