-Massive clean up to gizmos

-Make sure handles are always visible (on top)
-Fixed instanced scene selection (should work properly now)
-Added interpolated camera
-Customizable gizmo colors in editor settings

editor/plugins/spatial_editor_plugin.h

@@ -49,6 +49,7 @@ class SpatialEditorGizmo : public SpatialGizmo {
 	GDCLASS(SpatialEditorGizmo, SpatialGizmo);
 
 	bool selected;
+	bool instanced;
 
 public:
 	void set_selected(bool p_selected) { selected = p_selected; }
@@ -240,7 +241,7 @@ private:
 	void set_message(String p_message, float p_time = 5);
 
 	//
-	void _update_camera();
+	void _update_camera(float p_interp_delta);
 	Transform to_camera_transform(const Cursor &p_cursor) const;
 	void _draw();