Use Command key instead of Control as modifier on macOS

This provides an experience closer to the original classic Mac version.

This is supported by the earlier changes to gracefully quit the game.

AerofoilSDL/GpDisplayDriver_SDL_GL2.cpp

@@ -1637,11 +1637,19 @@ static bool IdentifyVKey(const SDL_KeyboardEvent *keyEvt, GpKeyIDSubset_t &outSu
 				return false;
 		}
 		break;
+#ifdef __MACOS__
+	case SDLK_LGUI:
+#else
 	case SDLK_LCTRL:
+#endif
 		outSubset = GpKeyIDSubsets::kSpecial;
 		outKey.m_specialKey = GpKeySpecials::kLeftCtrl;
 		break;
+#ifdef __MACOS__
+	case SDLK_RGUI:
+#else
 	case SDLK_RCTRL:
+#endif
 		outSubset = GpKeyIDSubsets::kSpecial;
 		outKey.m_specialKey = GpKeySpecials::kRightCtrl;
 		break;

GpCommon/GpVOSEvent.h

@@ -97,8 +97,8 @@ namespace GpKeySpecials
 		kEnter,
 		kLeftShift,
 		kRightShift,
-		kLeftCtrl,
-		kRightCtrl,
+		kLeftCtrl,  // Maps to Command modifier on macOS.
+		kRightCtrl, //
 		kLeftAlt,
 		kRightAlt,
 		kNumLock,

PortabilityLayer/MenuManager.cpp

@@ -1405,14 +1405,22 @@ namespace PortabilityLayer
 
 	size_t MenuManagerImpl::FormatHintText(uint8_t *buffer, uint8_t key)
 	{
+#ifdef __MACOS__
+		buffer[0] = 'C';
+		buffer[1] = 'm';
+		buffer[2] = 'd';
+		buffer[3] = '+';
+		buffer[4] = key;
+		return 5;
+#else
 		buffer[0] = 'C';
 		buffer[1] = 't';
 		buffer[2] = 'r';
 		buffer[3] = 'l';
 		buffer[4] = '+';
 		buffer[5] = key;
-
 		return 6;
+#endif
 	}
 
 	MenuManagerImpl *MenuManagerImpl::GetInstance()