The remote debugger components moved to their minimum framework install
to 4.6.2 where it was previously 2.0. That means we can remove the uses
of `netstandard1.3` in our code base as they existed just to support
this specific case.

This means we can also remove our use of `net2.0` in the code base and
replace it with `net462`. That is a more involved changed though and
going to take that a piece at a time. Removing `netstandard1.3` is an
important step because presently it's blocking us from updating to the
latest System.Collections.Immutable as it dropped support for
`netstandard1.3`