[TASK] Deprecate GraphicalFunctions->tempPath and createTempSubDir()

The short-hand functionality within GraphicalFunctions to create a
sub directory inside the hard-coded tempPath is a simple wrapper
of GeneralUtility::mkdir_deep().

The according change deprecates both the property $tempPath
and the method createTempSubDir().

Resolves: #80514
Releases: master
Change-Id: Ie0f0ac017e979ab67820182d16d7a4ebbc2fd4e4
Reviewed-on: https://review.typo3.org/52212


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Frank Naegler <frank.naegler@typo3.org>
Tested-by: Frank Naegler <frank.naegler@typo3.org>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>