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Improper Highlighting Bug Fixed

Apparently I introduced a bug with the last major update to Regex Hero. The multi-threading I put in place had a few problems. On rare occasions you'd see highlighting that made no sense at all.

I'm doing multi-threaded auto-saving, multi-threaded benchmarking, and even multi-threaded initialization in Regex Hero. But I need to set aside more time to figure out a way to do multi-threading for the real-time highlighting more reliably.

For now I had to revert back to the old way of doing things. It may not be fast when dealing with massive amounts of text. But at least it's reliable.

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