TYPO3.Neos

[TASK] Deprecate ContentElement ViewHelper

This change makes the ContentElement ViewHelper obsolete. Required
meta data attributes are added via a TypoScript processor on all
TS objects extending ``TYPO3.Neos:Content``.

Old CE template::
<neos:contentElement node="{node}"> {someProperty}
</neos:contentElement>

New CE template::
<div> {someProperty}
</div>

Note: It's recommended to always add a unique root element to your CE
template (the div tag in this example) so that the TypoScript processor
can use that to add meta data attributes.
Otherwise a wrapping tag will be added in the backend.

This change has following effects in detail:

• Deprecate ContentElement ViewHelper in a backwards compatible way.
  If used, the ViewHelper still renders a tag but this has no
  advantage over hard-coding that tag in the template itself
• Add ``ContentElementWrappingImplementation`` TypoScript object and
  register it as processor to all ``TYPO3.Neos:Content`` elements.
• Remove ``neosBackendDocumentNodeData`` TS object & template and
  render document node meta data in the NeosBackendHeaderData.html
  template instead using a new ViewHelper that renders a meta tag in
  the head of the backend html (instead of a hidden div in the body).

Change-Id: I91f05e798229e7d6bd613d14a43e68d79678a8a0
Resolves: #54137
Reviewed-on: https://review.typo3.org/25883
Tested-by: Bastian Waidelich
Reviewed-by: Christopher Hlubek
Tested-by: Christopher Hlubek
Reviewed-by: Aske Ertmann
Tested-by: Aske Ertmann
Reviewed-by: Bastian Waidelich

[!!!][TASK] Generate content element class attributes via TypoScript

Currently classes such as "typo3-neos-nodetypes-text" or
"typo3-neos-nodetypes-headline" are added automagically added through
the ``ContentElementWrappingService``.

This change moves the creation of class attributes in the frontend to
a new property ``attributes`` of the ``TYPO3.Neos:Content``
TypoScript object so that its behavior can be adjusted.

If you don't need these auto-generated class attributes you can
disable this behavior in your site's TypoScript with::

prototype(TYPO3.Neos:Content) {
   attributes.class.@process.nodeType >
 }

This is a breaking change because it removes the previously rendered
"neos-contentelement" class attribute. It also disables the
auto-generated id attribute (id="c<UUID>") for now.
If you need this behavior, you could add it to your TypoScript via::

prototype(TYPO3.Neos:Content) {
   attributes.id = ${'c' + q(node).property('_identifier')}
 }

Change-Id: I54f3b27eaf1f3bb1d353609cb2ea6679ed35fc08
Related: #54137
Reviewed-on: https://review.typo3.org/25911
Reviewed-by: Bastian Waidelich
Tested-by: Bastian Waidelich
Reviewed-by: Aske Ertmann
Tested-by: Aske Ertmann
Reviewed-by: Christian Mueller
Tested-by: Christian Mueller