Update to .NET 6

OpenRA.Mods.Common/Widgets/Logic/Installation/InstallFromDiscLogic.cs

@@ -13,6 +13,7 @@ using System;
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
+using System.Runtime.InteropServices;
 using System.Threading.Tasks;
 using OpenRA.Mods.Common.FileFormats;
 using OpenRA.Widgets;
@@ -472,6 +473,11 @@ namespace OpenRA.Mods.Common.Widgets.Logic
 				if (Platform.CurrentPlatform != PlatformType.Windows)
 					return null;
 
+				// We need an extra check for the platform here to silence a warning when the registry is accessed
+				// TODO: Remove this once our platform checks use the same method
+				if (!RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
+					return null;
+
 				foreach (var prefix in source.RegistryPrefixes)
 				{
 					var path = Microsoft.Win32.Registry.GetValue(prefix + source.RegistryKey, source.RegistryValue, null) as string;

OpenRA.Mods.Common/Widgets/Logic/SystemInfoPromptLogic.cs

@@ -56,7 +56,7 @@ namespace OpenRA.Mods.Common.Widgets.Logic
 
 			return $"&sysinfoversion={SystemInformationVersion}&"
 			       + GetSystemInformation()
-				       .Select(kv => kv.Key + "=" + Uri.EscapeUriString(kv.Value.Value))
+				       .Select(kv => kv.Key + "=" + Uri.EscapeDataString(kv.Value.Value))
 				       .JoinWith("&");
 		}