Add Switch platform

Source/Tools/Flax.Build/Build/DepsModule.cs

@@ -31,6 +31,7 @@ namespace Flax.Build
             case TargetPlatform.Linux:
             case TargetPlatform.PS4:
             case TargetPlatform.Android:
+            case TargetPlatform.Switch:
                 options.OutputFiles.Add(Path.Combine(path, string.Format("lib{0}.a", name)));
                 break;
             default: throw new InvalidPlatformException(options.Platform.Target);

Source/Tools/Flax.Build/Build/Module.cs

@@ -90,6 +90,7 @@ namespace Flax.Build
             case TargetPlatform.PS4: return "PLATFORM_PS4";
             case TargetPlatform.XboxScarlett: return "PLATFORM_XBOX_SCARLETT";
             case TargetPlatform.Android: return "PLATFORM_ANDROID";
+            case TargetPlatform.Switch: return "PLATFORM_SWITCH";
             default: throw new InvalidPlatformException(platform);
             }
         }

Source/Tools/Flax.Build/Build/Platform.cs

@@ -230,6 +230,7 @@ namespace Flax.Build
             case TargetPlatform.Linux: return targetArchitecture == TargetArchitecture.x64;
             case TargetPlatform.PS4: return targetArchitecture == TargetArchitecture.x64;
             case TargetPlatform.Android: return targetArchitecture == TargetArchitecture.ARM64;
+            case TargetPlatform.Switch: return targetArchitecture == TargetArchitecture.ARM64;
             default: return false;
             }
         }

Source/Tools/Flax.Build/Build/TargetPlatform.cs

@@ -41,6 +41,11 @@ namespace Flax.Build
         /// Running on Android.
         /// </summary>
         Android = 7,
+
+        /// <summary>
+        /// Running on Switch.
+        /// </summary>
+        Switch = 8,
     }
 
     /// <summary>