Allow uci engine not to set ponder

Merge branch 'master' of https://github.com/windler/chess

Merge branch 'notnil:master' into master

Merge branch 'notnil:master' into master

comments added in new game constructor (notnil#97)

Co-authored-by: Logan Spears <logan@logans-mac-mini.lan>

pgn comments now write out (notnil#96)

* pgn comments now write out

* added check for games without comments

Merge pull request notnil#91 from sumnerevans/promote-to-non-queen

notation parsing: parse promotions to non-queen pieces

Merge pull request notnil#86 from sumnerevans/decode-pgn-fixes

decodePGN: convert to a more resillient parser

Comments (notnil#76)

* first pass

* added fixtures for scanner tests

* fix eof issues w/ scanner

* doc for comments, simplify hash function which is slightly faster

Co-authored-by: Logan Spears <logan@logans-mac-mini.lan>

binary encoding for position (notnil#67)

* binary encoding for position

* removed temp comments