Discord Integration 2.9.0

• When sending a notification to Discord, include the author's avatar if they have one.
• Handle cases where optout value may be nulled out.

• Simplify the process of opting in to mirrored Discord alerts to prevent confusion.

• Add an option to announce new associations to a specific Discord channel.

• If usernames are being synced, ensure any username changes to Discord are synced too.
• Add an option to kick users from your Discord server if they disconnect their forum account.
• If a user is banned on your forum, this will now be mapped to Discord properly rather than disconnecting them.
• Fix blocking user creation when add-on is disabled.

• Minor rework of the option to prevent registering and/or logging in with Discord.
• Add missing user change log phrase.

• Add support for announcement channels so notifications can be cross-posted to them.

• Strip extraneous characters from mirrored alert messages

• Require XenForo 2.2+.
• Require PHP 7.2+.
• Require Standard Library.
• Confirm support for XF 2.2.0.
• Harden various template modifications.
• Remove user from server roles when they disassociate or get banned.

• Fix an issue preventing new thread reply notifications from being sent to Discord.

• Add the ability to automatically add users to your Discord server when they first associate their account.
• Switch API and other URLs from discordapp.com to discord.com. This is in line with Discord's recently announced endpoint migration that will come in to effect on November 7, 2020.
• Bump PHP version requirement to 7.2.0 or greater.
• Bump XenForo version requirement to 2.1.0 or greater.
• Other assorted code improvements and clean-up.