Add null move and push_move

[AttackingOrDefending]

Changes:

• Added null move.
• Added push_move, where you can give the whole multi-capture instead of sending it one by one (e.g. game.push([[40, 23], [23, 14]]) instead of game.move([40, 23]); game.move([23, 14])).
• Small bug fixes for draw detection.
• Renamed push_move to push_str_move to avoid confusion with the newly added push.

Minor comments:

• Added a 10% threshold in codecov/patch.
• Tests were added for these changes.

[codecov-commenter]

Codecov Report

Merging #14 (ff7a6c9) into main (c4a8d51) will increase coverage by 0.06%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #14      +/-   ##
==========================================
+ Coverage   93.36%   93.42%   +0.06%     
==========================================
  Files          18       18              
  Lines        2727     2752      +25     
==========================================
+ Hits         2546     2571      +25     
  Misses        181      181              

Impacted Files	Coverage Δ
draughts/PDN.py	100.00% <100.00%> (ø)
draughts/core/game.py	100.00% <100.00%> (ø)
draughts/core/move.py	100.00% <100.00%> (ø)
draughts/engines/dxp_communication/dxp_run.py	66.23% <100.00%> (-0.29%)	:arrow_down:
draughts/engines/hub.py	91.04% <100.00%> (-0.05%)	:arrow_down:

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