Systemctl / journalctl wrappers for Go

This is a small library that wraps the systemctl and journalctl CLIs for use in Go programs.

There are CGo implementations that does the same but these require no cgo and invokes the executables directly and parses the output.

This obviously only works on computers where there are systemctl and journalctl commands available.

This implements a bare minium of what's needed now so it's not exactly jam-packed with features :)