Silence IDE0290.

This rule recommends use of primary constructors. Apply the suggestions on simple POCOs, adjusting some to readonly/structs/records at the same time. For more complex classes, the use of primary constructors is more distracting than helpful, so silence the rule. IDEs can still offer fixes for using primary constructors, but it will not show up as a build issue.

OpenRA.Game/FieldLoader.cs

@@ -841,9 +841,8 @@ namespace OpenRA
 
 	// Mirrors DescriptionAttribute from System.ComponentModel but we don't want to have to use that everywhere.
 	[AttributeUsage(AttributeTargets.All)]
-	public sealed class DescAttribute : Attribute
+	public sealed class DescAttribute(params string[] lines) : Attribute
 	{
-		public readonly string[] Lines;
-		public DescAttribute(params string[] lines) { Lines = lines; }
+		public readonly string[] Lines = lines;
 	}
 }