speedup for EDBM_uv_vert_map_create(), reduce customdata lookups. also remove redundant check for hidden faces.


git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@53751 954f8c5b-7b00-dc11-b283-0030488c597c
BGE: Adding preliminary alpha shadow support for Simple shadow maps. They do not work in the viewport nor do they work for Variance shadow maps.

git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@53752 954f8c5b-7b00-dc11-b283-0030488c597c