The whitespace-fixing script seems to be slightly different depending on the platform.
Even though it produces no effect in the CI, it made these changes locally on my Mac.
I'm committing them now so as to avoid unrelated files being changed in other pull requests.
All CAs can be store in external .lua files. If the scenario config
lacks an [engine] tag for the Lua AI engine, but still tries to use CA
with engine=lua, a dummy engine will be automatically generated,
providing the needed functionality
