[TASK] EXT:setup Uniform extension directory structure

Moved the code from the mod directory to the Modules/Setup directory.

Resolves: #68350
Releases: master
Change-Id: Ibd9850c426dbf703939741faa8736d6b25760971
Reviewed-on: http://review.typo3.org/41710


Reviewed-by: Susanne Moog <typo3@susannemoog.de>
Tested-by: Susanne Moog <typo3@susannemoog.de>
Reviewed-by: Stefan Froemken <froemken@gmail.com>
Tested-by: Stefan Froemken <froemken@gmail.com>