[!!!][FEATURE] Refactor and streamline click menu / context menu

This change unifies the ClickMenu functionality of the pagetree (ExtJS)
with the ClickMenu code given in other areas of the TYPO3 Backend.

The following changes are made:
* Unify the naming, it's "ContextMenu" not "ClickMenu" anymore
* Configuration for record types are unified, the clickmenu shows
  the same entries in the same order in any place.
* ExtJS-based ContextMenu is removed, all based on the new
  ContextMenu functionality.
* A new way for extending the items inside the ContextMenu
  is handled via ItemProviders, which can easily be extended.
* Configuring clickmenu items is not done based on PageTS (as it
  was handled with the ExtJS pagetree), however certain items can
  be disabled via PageTS.

Resolves: #78192
Releases: master
Change-Id: I380ac73ced10fdc7b1fdec7261e2d56da3d7d938
Reviewed-on: https://review.typo3.org/50124


Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Benni Mack <benni@typo3.org>
Tested-by: Benni Mack <benni@typo3.org>