Filter everyone/here pings if the proxy sender doesn't have permission

PluralKit.Bot/Utils.cs

@@ -82,6 +82,9 @@ namespace PluralKit.Bot
 
         public static string Sanitize(this string input) =>
             Regex.Replace(Regex.Replace(input, "<@[!&]?(\\d{17,19})>", "<\\@$1>"), "@(everyone|here)", "@\u200B$1");
+        
+        public static string SanitizeEveryone(this string input) => 
+            Regex.Replace(input, "@(everyone|here)", "@\u200B$1");
 
         public static async Task<ChannelPermissions> PermissionsIn(this IChannel channel)
         {