Import 3D Scene Improvements

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

-If re-importing from the "dependency changed" dialog, edited scene will keep the local changes.
-Imported scene will keep track of changes in the source asset
-Geometry changes in source geometry or nodes with a different transform will be updated.
-Materials will be kept if changed locally.
-New nodes added will be kept
-If nodes were reparented or renamed, they will still keep track
-Deleted notes will be restored, use the -noimp option to avoid this.
-In general, you can trust that if you do local modifications to the imported scene, they will not be erased after re-import.
-Erasing your changes is done by re-importing from the "Re-Import" menu, re-opening the "Import 3D Scene" dialog. This wil re-import fresh.

Overall, This should allow you to work on a scene and see changes made to 3D assets in real-time.

So Please test!!

scene/main/node.cpp

@@ -1698,6 +1698,20 @@ Array Node::_get_children() const {
 	return arr;
 }
 
+#ifdef TOOLS_ENABLED
+void Node::set_import_path(const NodePath& p_import_path) {
+
+
+	data.import_path=p_import_path;
+}
+
+NodePath Node::get_import_path() const {
+
+	return data.import_path;
+}
+
+#endif
+
 
 void Node::_bind_methods() {
 
@@ -1760,6 +1774,12 @@ void Node::_bind_methods() {
 	ObjectTypeDB::bind_method(_MD("get_viewport"),&Node::get_viewport);
 
 	ObjectTypeDB::bind_method(_MD("queue_free"),&Node::queue_delete);
+#ifdef TOOLS_ENABLED
+	ObjectTypeDB::bind_method(_MD("_set_import_path","import_path"),&Node::set_import_path);
+	ObjectTypeDB::bind_method(_MD("_get_import_path"),&Node::get_import_path);
+	ADD_PROPERTY( PropertyInfo(Variant::NODE_PATH,"_import_path",PROPERTY_HINT_NONE,"",PROPERTY_USAGE_NOEDITOR),_SCS("_set_import_path"),_SCS("_get_import_path"));
+
+#endif
 
 	BIND_CONSTANT( NOTIFICATION_ENTER_SCENE );
 	BIND_CONSTANT( NOTIFICATION_EXIT_SCENE );