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Unlimited Undos & Redos, and a Bug Fix

This was an interesting challenge, but I was able to get multiple undos & redos working in Regex Hero. So now you can press Ctrl+Z (undo) or Ctrl+Y (redo) within the tool, and you'll notice that each textbox has an infinite undo history. It's something I usually take for granted in most applications, but the Silverlight textboxes didn't support it natively so I had to write the functionality myself. It seems to be working pretty well now.

While I was at it I also fixed a bug with the RightToLeft option within the tool. Before it would highlight the wrong text most of the time when you had the RightToLeft option turned on, but it's working now. I just had to reverse the order in which I build the highlighted text.
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