[TASK] Split Frontend Requests logic - part 1

The Frontend Request Handler now uses
class properties for TSFE and TT to split
up the functionality into smaller pieces.

This is the first step in a series of cleaning
up the frontend rendering logic.

Resolves: #65914
Releases: master
Change-Id: I61289c8bb03bde03d6fa5e0f7fd59fa3d5c5b4e4
Reviewed-on: http://review.typo3.org/38021


Reviewed-by: Nicole Cordes <typo3@cordes.co>
Tested-by: Nicole Cordes <typo3@cordes.co>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>