feat: add -raw flag to pk;msg (#399)

PluralKit.Bot/Utils/DiscordUtils.cs

@@ -9,6 +9,7 @@ using Myriad.Builders;
 using Myriad.Extensions;
 using Myriad.Gateway;
 using Myriad.Rest;
+using Myriad.Rest.Exceptions;
 using Myriad.Rest.Types;
 using Myriad.Types;
 
@@ -56,6 +57,19 @@ namespace PluralKit.Bot
             }
         }
 
+        public static async Task<Message?> GetMessageOrNull(this DiscordApiClient rest, ulong channelId, ulong messageId)
+        {
+            try
+            {
+                return await rest.GetMessage(channelId, messageId);
+            }
+            catch (ForbiddenException)
+            {
+                // no permission, couldn't fetch, oh well
+                return null;
+            }
+        }
+
         public static uint? ToDiscordColor(this string color)
         {
             if (uint.TryParse(color, NumberStyles.HexNumber, null, out var colorInt))