[Bug] Regex for determining specific message from link has serious limitations

Method FindMessageFromLink doesn't support canary or ptb links. Additionaly, in case the message is located in thread, the lookup fails.

Code:

Line 34 in b0d9370

    
           const string pattern = @"https://discord(?:app)?\.com/channels/(?:\d+)/(\d+)/(\d+)/?";