"ParseAlternationAndGroups" method added (preparation for quantifiers)
Plus, Star and QuestionMark now derive from Quantifier
Quantifier ranges can be parsed now
Quantifier ranges now include a following lazy modifier (question mark) if present
Quantifier ranges within alternations are now parsed correctly, too
Moved quantifier characters (+, *, and ?) to outer folder
Lazy quantifier recognition
Enabled basic syntax highlighting
Bugfixes and small modifications
Parsing of group syntax tokens
Converted lots of if-else constructs to switch statement
Small, but important bugfix
Merge branch 'quantifiers'