Innitial commit of experimental v2 texture system port work. Compiles and runs on windows, at least. Fixing bugs as they come.

Need to test:
localassetbrowser
preview related floaters
hgfloatertexteditor
maps
media textures! Currently very hacky
web browser
alpha masks on avatars
bumpmaps
Are all sky components appearing?
LLViewerDynamicTexture (texture baking, browser, animated textures, anim previews, etc)
Snapshot related features
Customize avatar
vfs floater
UI textures in general
Texture priority issues

indra/llmath/llvolume.cpp

@@ -3391,7 +3391,8 @@ void LLVolume::generateSilhouetteVertices(std::vector<LLVector3> &vertices,
 										  std::vector<S32> &segments,
 										  const LLVector3& obj_cam_vec,
 										  const LLMatrix4& mat,
-										  const LLMatrix3& norm_mat)
+										  const LLMatrix3& norm_mat,
+										  S32 face_mask)
 {
 	LLMemType m1(LLMemType::MTYPE_VOLUME);
 	
@@ -3399,12 +3400,17 @@ void LLVolume::generateSilhouetteVertices(std::vector<LLVector3> &vertices,
 	normals.clear();
 	segments.clear();
 
+	S32 cur_index = 0;
 	//for each face
 	for (face_list_t::iterator iter = mVolumeFaces.begin();
 		 iter != mVolumeFaces.end(); ++iter)
 	{
 		const LLVolumeFace& face = *iter;
 	
+		if (!(face_mask & (0x1 << cur_index++)))
+		{
+			continue;
+		}
 		if (face.mTypeMask & (LLVolumeFace::CAP_MASK)) {
 	
 		}