[BUGFIX] t3lib_div::cmpFQDN() lacks support for IPv6 and hostnames

Add checks for IPv4 and IPv6. Otherwise take input as hostname.
Implement correct (recursive) wildcard-checks.
Add unit tests.

Change-Id: I721fb6d376ee9ef01352799dfad1813b38e87ded
Resolves: #27217
Releases: 4.5, 4.6
Reviewed-on: http://review.typo3.org/2526
Reviewed-by: Philipp Gampe
Tested-by: Philipp Gampe
Reviewed-by: Xavier Perseguers
Tested-by: Xavier Perseguers