Xcode project fixes (#77)

* Compiles for Snow Leopard Again

* Fix Build on Xcode 14

* Fixed Xcode Universal Build

* Update Xcode Schemas

---------

Co-authored-by: Brent Da Mage <BrentDaMage@users.noreply.github.com>

source/common/Logger.cpp

@@ -3,6 +3,7 @@
 
 #include "Logger.hpp"
 #include "Util.hpp"
+#include "Utils.hpp"
 
 Logger* Logger::m_singleton = nullptr;
 

source/common/Utils.hpp

@@ -24,10 +24,16 @@
 #include <sstream>
 
 #ifdef USE_OLD_CPP
+#ifndef constexpr
 #define constexpr const
+#endif
+#ifndef nullptr
 #define nullptr NULL
+#endif
+#ifndef override
 #define override
 #endif
+#endif
 
 #if defined(_WIN32)
 
@@ -583,7 +589,7 @@ struct TilePos : Pos
 #define SAFE_DELETE(ptr) do { if (ptr) delete ptr; } while (0)
 #define SAFE_DELETE_ARRAY(ptr) do { if (ptr) delete[] ptr; } while (0)
 
-#define SSTR( x ) static_cast< std::ostringstream & >( \
+#define SSTR( x ) static_cast< const std::ostringstream & >( \
 		( std::ostringstream() << std::dec << x ) ).str()
 
 typedef uint8_t TileID;