Updated docs about MyGUI dynamics
Added signals for new path created and path deleted in LocationModelManager
Updated STEEL_WRONG_CODE_PATH
Added UIPanel::SteelTreeControlDataSourceConfigFileBaseName to MyGUITreeControlFileSystemDataSource for automatic folder opening persistence
Integrated LocationModel path assignment to MyGUI UI.
Constified some more stuff in Level and added forgotten include in Editor.cpp
Implemented fileTreeDataSrouec node expanding in persistent config file
Added safe delete