Add keyboard shortcuts for piece moving
Submitted by Robert Ancell
Add keyboard shortcuts for piece moving - i.e pressing a2a3 should move a white pawn. Pressing the first 'a' should highlight the a file and timeout if the rank is not entered in time. When a valid file and rank are entered the square should be selected as the mouse does. Escape should clear the selection.
Consider allowing SAN being entered?
Version: git master