Incorrect handling of unicode ANSI skipping

[ztravis]

The current implementation of unicode ANSI replacement sequences is slightly wrong - according to https://www.biblioscape.com/rtf15_spec.htm

• A scope delimiter (i.e. "{" or "}") should end the current skippable data
• Control words or symbols should be considered a single skipped character (and in my testing with MS office, they're ignored)
• Any binary data is also considered a single skipped character

I plan on opening a PR for these, just wanted to open an issue first in case that takes a while.

[Gurushesh-Metapercept]

@ztravis , could you please tell me how to run rtfparserkit? I have created a Maven project and added rtfparserkit as a dependency, but I'm still encountering errors. Have you successfully run it? If so, could you share any guidelines or solutions you have?