Move Rebugger.linerange here

[oxinabox]

I am looking at moving MagneticReadHead over,
and one of the things I need,
that I have not yet found,
is Rebugger.linerange

https://github.com/oxinabox/MagneticReadHead.jl/pull/19/files#diff-5bc73867852c5cbc0f53b0fbdca1b5f8R38