Editing Engine Testing

=== Steps to test the engine ===
# Host a Custom room and set a password.
# Check https://github.com/beyond-all-reason/spring/releases for the most recent version.
# Look at the most recent release.
# Type '!engine X' where X is the part after {BAR105}. At the time of writing X is '105.1.1-475-gd112b9e'.
# If Nightwatch says 'Engine changed to X' then the engine was set successfully. See the heading below if it fails.
# Optional: Remove the password with '!password'.
# Not Optional: Do not change the game mode from Custom, this will reset the engine to default.
# ''WARNING skirmish AIs other than 'AI: Legacy' will not work as they need rebuilding for each engine.''
# Have people join the game, screw around in the lobby, etc.
# Reassure everyone that it is fine if nothing appears to happen for many minutes when you start the game.
# Start the game.
# Wait for the engine to silently download in the background.
# Have the game start, spend a while caching, and exit because you took minutes to connect.
# Go back to the lobby, wait for everyone to indicate that they have completed the previous two steps.
# Start the game - for real this time (or maybe the second last time, because now you have to do the first-time ZK launch cache).
# Note any weirdness, bugs, or performance issues on the battle thread or elsewhere.
# Have everyone else in the room do the above.
# Repeat

=== What if Step 5 Fails? ===
Two options:
# Ask GoogleFrog to load the desired release into the server.
# Try a release further down the list.