[TASK] Add support for "outdated" extensions

Extension Manager displays installed extensions which are marked as
"outdated" with different styling. Reports module also checks for
installed and available "outdated" extensions.

Change-Id: I3050f3f7142e4153954f1b7f76b4bf64a3066223
Resolves: #49350
Releases: 6.2, 6.1, 6.0, 4.7, 4.5
Reviewed-on: https://review.typo3.org/21742
Reviewed-by: Philipp Gampe
Tested-by: Philipp Gampe
Reviewed-by: Ernesto Baschny
Tested-by: Ernesto Baschny