New lightmapper

-Added LocalVector (needed it)
-Added stb_rect_pack (It's pretty cool, we could probably use it for other stuff too)
-Fixes and changes all around the place
-Added library for 128 bits fixed point (required for Delaunay3D)

scene/scene_string_names.cpp

@@ -205,4 +205,9 @@ SceneStringNames::SceneStringNames() {
 
 	shader_overrides_group = StaticCString::create("_shader_overrides_group_");
 	shader_overrides_group_active = StaticCString::create("_shader_overrides_group_active_");
+
+#ifndef DISABLE_DEPRECATED
+	use_in_baked_light = StaticCString::create("use_in_baked_light");
+	use_dynamic_gi = StaticCString::create("use_dynamic_gi");
+#endif
 }