QOL changes and bug fixes.

Added

• update_notifications configuration option to toggle bot autoupdate notifications. (GH #2896)
• ?fareply, anonymously reply with variables.
• anonymous_snippets config variable to toggle if snippets should be anonymous. (GH #2905)
• disable_updates config variable to control if the update command should be disabled or not.
• silent_alert_on_mention to alert mods silently. (GH #2907)
• Support for only the "Server Members" intent.

Improved

• Added command validation to autotrigger add/edit.
• GITHUB_TOKEN is now no longer required in Heroku setups.
• Clearer error messages on reply fails.

Fixed

• Mentioned competing as an activity type. (PR #2902)
• Level permissions were not checked if command permissions were set.
• Regex autotriggers were not working if term was in the middle of strings.
• ?blocked now no longers show blocks that have expired.
• Blocked roles will no longer trigger an error during unblock.
• Custom emojis are now supported in confirm_thread_creation_deny. (GH #2916)
• Finding linked messages in replies work now. (GH #2920, Jerrie-Aries)
• Sending files in threads (non-images) now work. (GH #2926)
• Deleting messages no longer shows a false error. (GH #2910, Jerrie-Aries)
• Display an error on Lottie stickers, instead of failing the send.
• ?perms get now shows role/user names. (PR #2927)

Internal

• Make use of git branch --show-current to retrieve branch instead of using prerelease version check.
• Use discord.py 1.6.0 from PyPi instead of the development clone.