[FEATURE] Upgrade Analysis in Install Tool

Noteworthy core changes come with ReST files explaining details since
core version 7. The patch adds a module to the install tool to render
those files.

This patch is the first part of a larger feature that will end up with
automated code migration and upgrade support based on code analysis.

Resolves: #75691
Releases: master
Change-Id: Ib74f4b806db8fbb215963838bbb1812a94503164
Reviewed-on: https://review.typo3.org/47621


Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Jan Helke <typo3@helke.de>
Tested-by: Jan Helke <typo3@helke.de>