Feature/line numbers for text view #49
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…p with actual error line but this was already an issue.
This removes the `grammar`<->NSTextView KVO. This change also gets rid of enable/disable state for `textView` since it breaks undo history and I don't think it actually adds any value. Now uses `[self.textView string]` as the authoritative state of the view. After this change undo history is maintained after `generate` or `File`->`Save`.
…extView Conflicts: ParserGenApp/PGDocument.h
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This is a fix for issue #47. It adds line number to the text view.
It exposes a bug where the error alert box sometimes displays the wrong line number. Issue #48