opendbc 1.0

[adeebshihadeh]

opendbc 1.0 will have

• Good docs. README.md + the new car support docs should be enough here. If it's not, things are probably more complex than they should be.
• A complete test suite. This is mostly moving over test_models from openpilot.
• The panda dependency removed. The dependency relationship should go the other way once [panda/board/safety/](https://github.com/commaai/panda/tree/master/board/safety) is moved to opendbc/safety/.
• Good abstractions. This is mostly removing openpilot's car_specific.py.