[BUGFIX] Allow colon in last "displayCond" part

Explode the "displayCond"-string just to required
number of parts. So the last part can also contain colons.

Also backports unit-tests from ElementConditionMatcher of
TYPO3 6.1 and adds a check for this colon-bugfix here.

Resolves: #47988
Releases: 6.0, 4.7, 4.5
Change-Id: I940e17ea346dda91607573406fd83d919d83e36a
Reviewed-on: https://review.typo3.org/20552
Reviewed-by: Stefan Neufeind
Tested-by: Stefan Neufeind