Algebraic Notation

The move notation has been updated from long algebraic form to standard algebraic form, commonly seen on modern chess websites like chess.com and lichess.org. 

[e.g. "e2e4" => "e4" or "Ng1f3" => "Nf3"]

I also added mobile buttons for the keyboard shortcuts.

• ⟳ - Reset Board
• ⮐ - Undo Move
• ⇅ - Flip Board
• 🗎 - Copy Moves to Clipboard   <= This one's new, press "P" on your keyboard to use it.

The only bugfix this time was that when you clicked in the menu after playing a game, the square on the board you last clicked on would highlight. Very minor, but I thought it was worth mentioning anyways.