Add disabling autoproxy per-account

PluralKit.Core/Models/Patch/AccountPatch.cs

@@ -0,0 +1,10 @@
+namespace PluralKit.Core
+{
+	public class AccountPatch: PatchObject
+	{
+		public Partial<bool> AllowAutoproxy { get; set; }
+
+		public override UpdateQueryBuilder Apply(UpdateQueryBuilder b) => b
+			.With("allow_autoproxy", AllowAutoproxy);
+	}
+}