Introduce notation.h

And group there all the formatting functions but
uci_pv() that requires access to search.cpp variables.

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>

src/uci.cpp

@@ -22,6 +22,7 @@
 #include <string>
 
 #include "evaluate.h"
+#include "notation.h"
 #include "position.h"
 #include "search.h"
 #include "thread.h"