[TASK] Streamline form template files

For a more streamlined rendering this patch adds nessesary html tags
with fluid namespaces to all form templates, unifies indention
and adds an empty space before closing bracket of self-closing tags.
In addition the invalid end tag for thematic breaks was removed. 

Resolves: #80393
Releases: master
Change-Id: Id9d8917b5d5f48a480da711490656cc24f18061d
Reviewed-on: https://review.typo3.org/52121


Reviewed-by: Ralf Zimmermann <ralf.zimmermann@tritum.de>
Tested-by: Ralf Zimmermann <ralf.zimmermann@tritum.de>
Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Frank Nägler <frank.naegler@typo3.org>
Tested-by: Frank Nägler <frank.naegler@typo3.org>