Fix game crashing on NetworkingInit on Windows. Also add a 32-bit Windows build.

Also stubbed out InitSingleplayer in menu.cpp cuz this client doesn't want to work with servers correctly.

additions.hpp

@@ -0,0 +1,11 @@
+#ifdef WIN32 // FUCK WINDOWS
+    #include "external/fix_win32_compatibility.h"
+    #undef PlaySound
+#endif
+
+#include <enet/enet.h>
+
+#ifdef WIN32 // FUCK WINDOWS 2
+    #undef PlaySound
+    #undef Sound
+#endif