MassBuilderManager: use Magnum types.

src/MassBuilderManager/MassBuilderManager.h

@@ -16,11 +16,13 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
-#include <cstdint>
-
 #include <string>
 
-enum class GameState : std::uint8_t {
+#include <Magnum/Magnum.h>
+
+using namespace Magnum;
+
+enum class GameState : UnsignedByte {
     Unknown, NotRunning, Running
 };