* Experimental test for unit tests without display
* Ignore unit tests running on an invalid QT Platform (i.e. offscreen - running as a test on GitHub)
* Fix whitespace on Caption effect
* Check for env variable for QT_QPA_PLATFORM == offscreen, and ignore Caption unit tests (for GitHub checks)
- improved regex, which now detects lines without blank lines separating them, and detects captions that start with numbers
- line wrapping fixed for languages that don't use spaces
- forced line wrapping of long strings of characters