better command line syntax

gle now supports several different things:

• local builds/jobs
  • list
  • build
    • --full local pipelines
    • interactive mode
• remote pipelines
  • download build artifacts
  • export
  • list
  • cancel
  • build

It would be good to support a "command" orientated interface similar to docker, p4 or git. eg:

We probably need a new exe instead of gle as the current interface can't support this.

glp list
glp cancel
glp export
glp build

Also

glp build JOB [JOB1..N]
glp build JOB [JOB1..N] --from PIPELINE

And for downloading artefacts

glp get JOB [--needed]

And to run a local pipeline using gle optionally using pipeline artefacts:

glp local JOB [--from PIPELINE]