14.4.9 11:58pm

Messages shouldn't get called on objects that have been deleted now,
however, as object deletion isn't in yet, I can't test it. But in theory,
it should be safe.

The downside, though, is that now you can only register for messages in a
python's init function, until I find another way to associate the python
function with
14.4.10 12:11am

Added bat file for cleaning out build artifacts before committing
Should be able to register for python messages anywhere in the python file
now, but it needs testing