[TASK] Allow command controller classes to reside in subfolders

CommandController classes were required to reside in the main
folder inside Classes and have to be named like <name>CommandController.
With this change, the usage of subfolders is permitted, the namespace
needs to reflect the position under the Classes folder.
The CommandController Suffix is kept.

Resolves: #68758
Releases: master
Change-Id: Ic8afa101120bfde1397183c174a694aeddda63a0
Reviewed-on: http://review.typo3.org/42275


Reviewed-by: Felix Oertel <mehl@foertel.com>
Tested-by: Felix Oertel <mehl@foertel.com>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>