handle lichess commands in comments for squares and arrows

[ukscid]

handle multiple arrows/squares in a %cal / %cls command change [%cal Ra2a4,Yd4d5] to [%cal Ra2a4][%cal Yd4d5] lichess uses blue as color.

[benini]

Implemented with: https://github.com/benini/scid/commit/e59fd3790505ccf4287f76e0babc7ee38edb829f