Add -colorNickNames option

Add -colorNickNames option

This option allows non-standard designation of side to move in FENs.
(Useful for Xiangqi, where white is indicated often as r(ed), and Shogi,
where white is s(ente) or b(lack), and black is g(ote) or w(hite).)
Can also be used for FENs in a local language. A match of theinput
character with the nick name translates it to the standard; this means
the standard will continue to be recognized, unless it was defined as a
nick name.