Makes testnet block explorer link format configurable in discordbot

Author: benbierens

Tools/BiblioTech/Commands/MintCommand.cs

@@ -98,9 +98,7 @@ private bool ShouldSendEth(IGethNode gethNode, EthAddress addr)
 
         private string FormatTransactionLink(string transaction)
         {
-            TODO! this needs to be configurable when we switch to devnet.
-
-            var url = $"https://explorer.testnet.codex.storage/tx/{transaction}";
+            var url = Program.Config.TransactionLinkFormat.Replace("<ID>", transaction);
             return $"- [View on block explorer](<{url}>){Environment.NewLine}Transaction ID - `{transaction}`";
         }
     }

Tools/BiblioTech/Configuration.cs

@@ -44,6 +44,9 @@ public class Configuration
         [Uniform("codex-endpoint-auth", "cea", "CODEXENDPOINTAUTH", false, "Codex endpoint basic auth. Colon separated username and password. (default: empty, no auth used.)")]
         public string CodexEndpointAuth { get; set; } = "";
 
+        [Uniform("transaction-link-format", "tlf", "TRANSACTIONLINKFORMAT", false, "Format of links to transactions on the blockchain. Use '<ID>' to inject the transaction ID into this string. (default 'https://explorer.testnet.codex.storage/tx/<ID>')")]
+        public string TransactionLinkFormat { get; set; } = "https://explorer.testnet.codex.storage/tx/<ID>";
+
         #region Role Rewards
 
         /// <summary>