Get parsed comments from pgn

[leszekhanusz]

I am now trying to create a Pyside6 widget which simulates the Analysis Board on lichess.

It's beginning to work but the comments displayed contain all the %csl %cal visual annotations (and others things like evals or clocks)

Since python-chess already contains the ARROWS_REGEX and other regexes, it would be nice if we could get the parsing done in this library to get the final comment to be displayed to the user.