SceneMainLoop -> SceneTree

-=-=-=-=-=-=-=-=-=-=-=-=-=-

*YOUR SOURCE MIGHT NOT WORK*
For mor information on fix:
https://github.com/okamstudio/godot/wiki/devel_scene_tree

Other stuff:
-Shower of bullets demo
-Fixes all around

scene/3d/visual_instance.cpp

@@ -257,7 +257,7 @@ void GeometryInstance::_find_baked_light() {
 
 void GeometryInstance::_update_visibility() {
 
-	if (!is_inside_scene())
+	if (!is_inside_tree())
 		return;
 
 	_change_notify("geometry/visible");