An earlier clean-up didn't catch everything, broke the testingcheats
on/off command

Similar to moveobjects, this one tracks the state within the script.

Similar to the testingcheats one, except this one needs to track the
status within the command's script (no way to query it from the game)

Returns the current status of the testing cheats.

If the optional argument is provided, this will enable or disable the
cheats accordingly.

Works like the cheat system in the game: a decorated function will
automatically be registered to the remote control server.

Only callables can now be registered, there's no need to subclass the
Command anymore.

Allows entering cheats in Live mode (required services are not available
in e.g. world view, so freerealestate and friends don't work).

The client_cheat and client_id parameters can be passed to change the
way the command is executed. Should normally not be required.

Prevents creating a god-class for the command handler. Each command will
handle a GET or POST (or both) base path.

Added an echo command for POST requests, mostly for testing purposes.

Includes a very basic version of the mod, which can report its own
version at http://localhost:15454/version.