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Regex Analysis Bug Fixes

All of these updates relate to the analyzer, so if you're not a Regex Hero Professional user, then this won't affect you.

I received a report of an analysis bug related to character classes.  The regex analyzer wouldn't handle opening brackets inside a character class properly.

It's one of the finer details of the regular expression syntax.  You wouldn't think that [[abc] would be valid, but it is.  You don't have to escape the opening bracket inside the character class.  So now the analyzer interprets this as it should.

I've also fixed bugs around interpreting the \x00 (hex), \u0000 (unicode), and \k<group> (backreference) expressions.

P.S. The major updates I mentioned recently are still in the works.  So the price for Regex Hero Professional is still $20 for now.
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