Method: SAVE_FOLDERS
Method: GET_FOLDERS_BY_USER
Method: SAVE_ROOT_FOLDERS
Method: GET_ROOT_FOLDERS_STATE
Method: SAVE
Method: DELETE_FOLDER
Method: FOLDER_EXISTS_IN_PARENT
Method: EXPAND_FOLDER
Method: MOVE_FOLDER
Method: DISCARD_FOLDERS_CHANGES
Method: GET_FOLDERS
Method: ADD_FOLDER
Method: RENAME_FOLDER
Method: COLLAPSE_FOLDER
Method: REORDER_LEVEL