v2.8.1

impr: Use threads for /memory-match
impr: Add more external emojis to /memory-match
impr: Allow automuting mods
impr: Rename /memory to /memory-match
fix: Fix all autoreactions being broken
fix: Don't warn for bad words in display names
fix: Distinguish between display names and usernames in modlog
fix: Don't let people get negative XP
fix: Lower max user count for /xp graph
fix: Disable buttons if accepting /memory-match fails
fix: Correct /xp graph's text disappearing (hopefully)
fix: Allow removing RoboTop warns
fix: Stop sometimes logging the /memory-match ping deletions
fix: Tweak bad words list
fix: Mention /memory-match's default difficulty