Implements #6639 - Initial commit for ISPConfig CLI command framework with some first basic modules as examples. More to be added

This reverts merge request !1812

This reverts commit a8d78f68.

there are some parts where a user is added to a group with "adduser" command.
changed "adduser" to "usermod -a -G" since there is no "adduser" in gentoo.

Update upd_dev_collection.sql to remove regex mysql functions that will fail on older MySQL versions.