v2.2.10 - U15.3 support

Changes

• Added new and updated map names from U15.3 (@Guskit)
  • Fixed an error when exporting a session that had Purple Heart Lane running
• Fixed "The application did not respond" error when exporting larger sessions (@FlorianSW)

Update guide for self-hosters

git fetch --all --tags
git stash
git checkout v2.2.10
git stash apply

Now close and reopen the bot.py file.