Add internal logger to reduce verbosity

[jameslamb]

We were repeating this pattern many times:

msg <- "some text"
futile.logger::flog.fatal(msg)
stop(msg)

This will now look like:

msg <- "some text"
log_fatal(msg)

[bburns632]

Good stuff

[bburns632]

Explicitly importing the methods package. Such attention to detail good sir.

[jameslamb]

I'm nothing if not a professional