Use of Clock is not documented

[rutsky]

1. czml.czml.Clock is not exported, i.e. it's not available as czml.Clock as other primitives are (but czml.CZMLPacket accepts dict of properties for Clock).

2. currentTime, multiplier, range and step attributes have no defaults, so they must be specified.

Example of how I use Clock in my code:

        packet = czml.CZMLPacket(
            id='document',
            version='1.0',
            clock=czml.czml.Clock(
                currentTime=datetime.datetime.now().isoformat(),
                multiplier=1.0,
                range='CLAMPED',
                step='SYSTEM_CLOCK_MULTIPLIER',
            )
        )

[demarlio25]

I've been looking to a solution to this problem as well. Any updates to this?