Optional alpha channel support for entities

src/object_properties.h

@@ -60,6 +60,7 @@ struct ObjectProperties
 	bool static_save = true;
 	float eye_height = 1.625f;
 	float zoom_fov = 0.0f;
+	bool use_texture_alpha = false;
 
 	ObjectProperties();
 	std::string dump();