message: Auto-create _matrix webhook in channel.
diff: @@ -194,6 +194,10 @@ export class DiscordBot {
  if (botUser) {
  const webhooks = await chan.fetchWebhooks();
  hook = webhooks.filterArray((h) => h.name === "_matrix").pop();
  + // Create a new webhook if none already exists
  + if (!hook) {
  + hook = await chan.createWebhook("_matrix", "", "Matrix Bridge: Allow rich user messages");
  + }
  }
  try {
  if (!botUser) {
  