This required some modifications to the linux guest implementation. And
the other guests will have to be modified as well. This is because
`channel` is now `communicate`.
I don't use `activated` here because I'd really like to optimize
performance as much as possible, and loading files from disk is
generally slow. So instead of using `activated` I load the file at the
last possible moment which is when the exact class is being requested.
I don't think many people will do this outside of the core, and I'm not
too concerned.
Conor Horan-Kates
Mitchell Hashimoto
Jordi Llonch