Feature - Undo move(s)...

[nvrnight]

Need a way to be able to revert moves.

Something like game.Undo(5) which should undo the last 5 moves. Preferably removing them from the Moves history or having some way to filter out reversal moves so the previous move(after the undo) can be calculated and shown on the board.

[MisinformedDNA]

FYI: I'm working on this.

[thomas-daniels]

Partially done by MisinformedDNA in #25 - a few variants remain where implementation is required.