Automation protocols now supported

Lots of tinkering, but the major new features are support for Firefox Marionette and Chrome Debugging Protocol. The old system of FF-remote-control plugin is still there, but that plugin no longer works with newer version of Firefox so consider that mode deprecated.

Signed binaries are available here: https://dl.equinox.io/darrell_golliher/gotator/stable

If you want to run it on a raspberry pi (and I do!) the included Makefile will cross compile a binary for you. I mention the because I can't find where equinox supports the Linux arm builds the raspberry pi requires.