[FEATURE] Add PageTitle API

It is now possible to set the title tag of a page by using
the PageTitle API. You can register your own providers and
set the priority of the provider so you are in control when
multiple extensions of a page trying to set the title.

Resolves: #85678
Releases: master
Change-Id: I1b0314f96b6af7bdad94b9865d2e2525b715d5c3
Reviewed-on: https://review.typo3.org/57881


Reviewed-by: Richard Haeser <richard@maxserv.com>
Tested-by: Richard Haeser <richard@maxserv.com>
Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Susanne Moog <susanne.moog@typo3.org>
Tested-by: Susanne Moog <susanne.moog@typo3.org>
Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Tested-by: Andreas Fernandez <a.fernandez@scripting-base.de>