Added TicTacToe in Samples

Here's just one more sample — a tic tac toe game! 

It runs easily with `jruby -J-XstartOnFirstThread shoes4/bin/ruby-shoes shoes4/samples/simple-tictactoe.rb`.
We might be able to avoid the `animate` loop here if the `click` just updated the state of the `Tic` to set the current player's color onto it directly. Once the color is set on the rect it would stay, so we don't need to continually loop over it resetting the color.