[TASK] Deprecate various hooks in ContentObjectRenderer

The following hooks within ContentObjectRenderer have been marked as deprecated:

* $GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['tslib/class.tslib_content.php']['cObjTypeAndClass']
* $GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['tslib/class.tslib_content.php']['cObjTypeAndClassDefault']

Both concepts have been superseded in TYPO3 v6 with custom cObjects via

$GLOBALS['TYPO3_CONF_VARS']['FE']['ContentObjects']

* $GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['tslib/class.tslib_content.php']['extLinkATagParamsHandler']
* cObj->extLinkATagParams() is now also marked as internal, as it serves no purpose anymore once the hook gets removed.

In addition
* $GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['tslib/class.tslib_content.php']['typolinkLinkHandler']
is deprecated since the initial addition of LinkHandler APIs in TYPO3 v8.

Resolves: #90937
Releases: master
Change-Id: Iaa1ea741f0bfef472f51a8067d5cea2f9ffcb774
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/64055


Tested-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Susanne Moog <look@susi.dev>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Susanne Moog <look@susi.dev>