Add command line interface for Parser2 and friends

[Argmaster]

Currently PyGerber command line allows only rendering with legacy Parser infrastructure, which lacks plenty of features which are available in Parser2 infrastructure. To avoid breaking backwards compatibility new api shall be added.

pygerber render svg ./file.grb --color-scheme=copper

pygerber render svg ./file.grb --color-scheme=<json-dict-custom-color>

pygerber render jpg ./file.grb --file-type=detect

pygerber render png ./file.grb@copper

pygerber render project ./file.grb@copper ./file1.grb@silk