More coverage and bug fixes

[AttackingOrDefending]

• Fix small DXP bug (moves and time were taking 4 instead of 3 characters)
• Fix small CB bug (moves weren't converted to the variant that was played)
• Add a lot more tests

[codecov-commenter]

Codecov Report

Merging #16 (64fdd00) into main (380d2b8) will increase coverage by 3.96%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #16      +/-   ##
==========================================
+ Coverage   93.64%   97.60%   +3.96%     
==========================================
  Files          18       18              
  Lines        2753     2754       +1     
==========================================
+ Hits         2578     2688     +110     
+ Misses        175       66     -109     

Impacted Files	Coverage Δ
draughts/engines/checkerboard_extra/engine_64.py	97.84% <ø> (+2.15%)	:arrow_up:
draughts/core/game.py	100.00% <100.00%> (ø)
draughts/engines/checkerboard.py	91.81% <100.00%> (+11.08%)	:arrow_up:
...ts/engines/checkerboard_extra/get_checker_board.py	100.00% <100.00%> (ø)
draughts/engines/dxp_communication/dxp_classes.py	96.40% <100.00%> (+25.14%)	:arrow_up:
draughts/engines/hub.py	95.52% <100.00%> (+1.49%)	:arrow_up:
draughts/engines/dxp.py	95.58% <0.00%> (+2.20%)	:arrow_up:
... and 2 more

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