Discord Integration 2.11.0

Big thanks to @Xon for contributions to this release! This update also adds support for Report Centre Essentials.

• Support for Report Centre Essentials to add notifications for new open reports and when the total number of open reports reaches a certain threshold.
• Restore support for XenForo 2.0.x and harden API error handling.
• Migrate legacy XenForo 1 configuration to XenForo 2's connected account provider where required.
• Cap channel alert messages at 2000 characters.
• Implement caching (~5 minutes) of Discord channels to prevent slowing down ACP edit pages for forum/report queues.
• Remove unused XenForo 1 templates and old JavaScript.
• Add missing admin page for admin.php?discord.
• Add Discord options link to admin navigation.
• Allow connecting Discord accounts to be controlled via usergroup permissions.
• Add an option to disable logging in with Discord and add an icon and colour for XenForo 2.1 and up.
• Opt to use Discord specific phrases for channel and DM notifications for further customisation.
• If Discord Integration is not configured, offer a prompt to set it up.
• General improvements to the installer
• Other miscellaneous code improvements and clean up.

• Include conversation message in alert snippet.
• Opt not to send the alert to the person that sent the message.
• Bug fix for node edit page causing compatibility errors.

• If mirrored alerts is enabled, conversation notifications will also be DM'd to a user.
• Opt to use Discord icon in the admin panel.
• Handle API errors more gracefully.

• Repackage the add-on after a XF 2.1 release builder bug.

• Repackage the add-on after a XF 2.1 release builder bug.

This add-on now requires XenForo 2.1.0+.

• Minor tweaks to ensure XenForo 2.1 compatability.

• Remove unused admin navigation items that crept back in.
• Redo the JS for the Discord heartbeat to be more reliable.

This add-on now requires XenForo 2.0.10+.

• Use XenForo 2.0.10's new code event listener to sanely add an additional column for XF Resource Manager support when it is installed after this add-on.

• Remove some unused templates and options.
• Opt to use Xon's shareable installer bits and rework installer. Thanks @Xon!
• Ensure HTML attributes using phrases are escaped properly.

• Ensure HTML attributes using phrases are escaped properly