[TASK] EXT:filelist Uniform extension directory structure

Moved the code from the mod1 directory to the Modules/Filelist directory.

Resolves: #68336
Releases: master
Change-Id: Ieaf1eb27a95baf2414a730748c699fa0abd09ccb
Reviewed-on: http://review.typo3.org/41661


Reviewed-by: Susanne Moog <typo3@susannemoog.de>
Tested-by: Susanne Moog <typo3@susannemoog.de>
Reviewed-by: Frederic Gaus <frederic.gaus@flagbit.de>
Tested-by: Frederic Gaus <frederic.gaus@flagbit.de>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>