new fork - package.json and administrative changes

Administrative changes to copyright notices and names since this isn’t
endorsed by the original project

Also changed the name in the package.json and added a version so it’s
clear this is a different package than GRBLWeb
Changes to run as daemon

Added init script and absolute path option to config.js
Added return to zero

Added a button that returns to the working zero
Added immediate pause/unpause and spacebar pausing

Added code to immediately pause using grbl “!” and “~” commands.  Also
added some blocks to reject input if no serial connection is selected
and the ability to pause with a spacebar.