Request: make fblog usable as a library

[mcginty]

I've been using fblog and loving it, but typically like to build my own diagnosis tools for any complicated project. It would be incredible to have an fblog crate so I could use the features of fblog inside of other tools with custom settings!

[bomgar]

Hi. I'm not sure if I want to commit to a stable API. Is there something specific you want to do that cannot be done by simply spawning fblog as an external process?