Move the board code out to ui as it's only for board visualisation

ui/board.cpp

@@ -0,0 +1,43 @@
+#include "board.h"
+
+// ----------------------------------------------
+
+// Default constructor for the board
+CBoard::CBoard( unsigned int c, unsigned int r )
+: cols ( c )
+, rows ( r )
+, total ( rows * cols )
+{
+	board.resize(total,square_empty);
+}
+
+
+// constructor
+CBoard::CBoard( unsigned int c, unsigned int r, vunitVis_c&& b )
+: cols ( c )
+, rows ( r )
+, total ( rows * cols )
+, board ( std::move(b) )
+{
+	board.resize(total,square_empty);
+}
+
+// print get a slot on the board
+unitVis_c CBoard::get( const unsigned int c, const unsigned int r ) const
+{
+	if ( (r >= rows) || (c >= cols) )
+		return square_invalid;
+
+	return board[r*c];
+}
+
+// Get a square on the board
+unitVis_c CBoard::set( const unsigned int c, const unsigned int r , const unitVis_c n )
+{
+	if ( (r >= rows) || (c >= cols) )
+		return square_invalid;
+
+	unitVis_c old = board[r*c];
+	board[r*c] = n;
+	return old;
+}