Automatically mount binfmt_misc if not mounted already

Now my desktop also runs Alpine, I got annoyed enough by this to fix it lol.

The modprobe bit is not needed when using the Alpine package, but is when installing via pip. I'm not sure however how to properly check if a module has been loaded already. Checking the contents of /proc/modules I guess, but I don't know how to parse that.

Fixes #1135 (closed)