irsABC.appname>`.
:param appauthor: See `appauthor <platformdirs.api.PlatformDirsABC.appauthor>`.
:param version: See `version <platformdirs.api.PlatformDirsABC.version>`.
:param opinion: See `opinion <platformdirs.api.PlatformDirsABC.opinion>`.
:param ensure_exists: See `ensure_exists <platformdirs.api.PlatformDirsABC.ensure_exists>`.
:returns: runtime path tied to the user
rD