Using uint64 to check movements

[Wikunia]

• [X] Basic piece movement
• [X] Castle
• [X] En passant
• [x] Promotion
• [x] Detect check
• [X] Don't move into check
• [x] Detect pinned pieces and make them unable to move (besides in the direction of the pin)
• [x] disallow en passant when check

[codecov[bot]]

Codecov Report

:exclamation: No coverage uploaded for pull request base (main@9e6b345). Click here to learn what that means. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main       #1   +/-   ##
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  Coverage        ?   63.54%           
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  Files           ?        9           
  Lines           ?     1048           
  Branches        ?        0           
=======================================
  Hits            ?      666           
  Misses          ?      352           
  Partials        ?       30           

Flag	Coverage Δ
unittests	63.54% <0.00%> (?)

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