[FEATURE] Add generic data-* attribute

All elements in HTML5 can have any number of data-* attributes.
This additional array attribute on tag bases viewhelpers makes
it easier to add several data-* attributes to them:
  <f:form.textfield data="{foo: 'bar', baz: 'foos'}" />

Will render:
  <input data-foo="bar" data-baz="foos" ...

This is a backport from TYPO3.Fluid

Resolves: #61351
Related: #35748
Releases: 6.3
Change-Id: I3a6483e3293a7e18a3ee7fb5b04bf28bdb19d63d
Reviewed-on: http://review.typo3.org/32590
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Martin Sonnenholzer <martin.sonnenholzer@googlemail.com>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
[TASK] Remove class.tx_cms_layout.php from EXT:cms/layout

Class in unused and marked for removal in TYPO3 CMS 6.2

Resolves: #61232
Related: #61218
Releases: 6.3
Change-Id: I720020e5d36045f2cba3535b9bbb043c34f33715
Reviewed-on: http://review.typo3.org/32459
Reviewed-by: Markus Klein <klein.t3@reelworx.at>
Tested-by: Markus Klein <klein.t3@reelworx.at>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
[TASK] Additional Documentation for #61351

Add documentation for changelog for merged feature
'Add generic data-* attribute' for Fluid ViewHelpers.

Change-Id: Idfa80355b23d98ab6d9bf6b4ec3bed74b3365a7c
Resolves: #61389
Related: #61351
Releases: 6.3
Reviewed-on: http://review.typo3.org/32612
Reviewed-by: Frank Nägler <typo3@naegler.net>
Tested-by: Frank Nägler <typo3@naegler.net>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>