Added Wavefront OBJ format exporter

Exporter written by Apelsin:
https://github.com/Apelsin

TODO: Hookup avatar export

indra/llappearance/llavatarappearance.h

@@ -248,6 +248,11 @@ protected:
 	polymesh_map_t 									mPolyMeshes;
 	avatar_joint_list_t								mMeshLOD;
 
+// <edit>
+public:
+	const virtual avatar_joint_list_t& getMeshLOD() const { return mMeshLOD; }
+// </edit>
+
 /**                    Meshes
  **                                                                            **
  *******************************************************************************/

indra/llappearance/llavatarjointmesh.h

@@ -131,6 +131,10 @@ public:
 
 	void setIsTransparent(BOOL is_transparent) { mIsTransparent = is_transparent; }
 
+	// <edit>
+public:
+	LLFace* getFace() { return mFace; }
+	// </edit>
 private:
 	// Allocate skin data
 	BOOL allocateSkinData( U32 numSkinJoints );