Move all enum types definitions to types.h

Cleanup headers while there.

No functional change.

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

src/bitbase.cpp

@@ -17,20 +17,10 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-
-////
-//// Includes
-////
-
 #include <cassert>
 
 #include "bitboard.h"
-#include "square.h"
-
-
-////
-//// Local definitions
-////
+#include "types.h"
 
 namespace {
 
@@ -63,10 +53,6 @@ namespace {
 }
 
 
-////
-//// Functions
-////
-
 void generate_kpk_bitbase(uint8_t bitbase[]) {
 
   bool repeat;