Documentation: Architecture review - finished.
#3094316 changed message if inference is running.
#3158924 output is open if validation fails.
#3165510 TwoStep module description.
Reverting Regexp class, restoring lambda toString().
#3130639 Unify project properties design - repairing combo boxes.
Documentation: review of finished part of BasicXSDExporter.
 3097174 Sensible TwoStep defaults,  3168052 No cleaner selection - solving both
changed documentation according to previous commit
Fixing project preferences GUI.
#3168164 Merge State autoeditor checkbox malfunction - Fixed.
#3114934 AutoEditor should be able to save image of automaton to file - NPE fixed.
#3167669 NullException in XSD Exporter - Fixed.
Adding a TODO.
 3168786 Nested concatenation cleaner does not handle intervals - maybe works :P
#3168734 Empty XSD export - Fixed.
Documentation: TODOs in progress.
Documentation: Architecture: fixing TODOs.
Documentation: TwoStep: fixing TODOs.
Fixed support for intervals. Needs further refactoring.