[BUGFIX] EXT: setup relocate 'Save' button

Moves the form submit button to docheader.
Also adds a section divided between settings and reset actions.

Change-Id: I433853d3587b082e51c7c855f9461e9c861e28d5
Release: 4.7, 4.8
Fixes: #632
Reviewed-on: http://review.typo3.org/9789
Reviewed-by: Tolleiv Nietsch
Tested-by: Tolleiv Nietsch
Reviewed-by: Philipp Gampe
Tested-by: Philipp Gampe
Reviewed-by: Wouter Wolters
Tested-by: Wouter Wolters
Reviewed-by: Oliver Klee
Reviewed-by: Christian Kuhn
Tested-by: Christian Kuhn