Better support system specific scale calibration

[JohnDMcMaster]

There are a few hacks to get the system calibrated but it would be good to streamline this. Something like this in argus.j5 might be a good start:

    "microscopes": {
        "lip-x1_sn-2308002": {
            "model": "lip-x1",
            "sn": "sn-2308002",
            "um_per_pixel_raw_1x": 4.6728972
        },
    }