Setters are not needed as all the assigning gets handled inside the  file.
All Setters were removed.
The try-statements were used to excessively and were changed for manual checking

Getters are not needed according to the official nim documentation.
https://nim-lang.org/docs/manual.html#procedures-properties
Getters were replaced accordingly

Due to the official nim documentation the snake_case was now swapped
for camelCase.
Tests for nearly any move were added.
A new procedure can initialize a game with a given 8x8 board with pieces and determines if
they have been moved already.