Support command line options related to part class for CLI about stepcvt HOT 3 CLOSED

I saw there is a CountInfo class. I am not sure if this class is necessary. I just merged choices-ui branch into roy-a7 and the count information in that is a dependent property calculated applying UserChoice to ChoiceEffect, from a default base count.

One of the functionalities of your sub command changes the count of a part directly. Under the Choices framework, I am not sure what is the proper way to achieve the intended operation, or if such operation are even meaningful.

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@sree314 , should we keep the CountInfo class or let count be an attribute for PartInfo class? If the CountInfo class is unnecessary, command jsonfile editpart [partid] --count [num] will just override the count attribute of the part.

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The original idea was CountInfo would contain a choice that changes the .count property of PartInfo. This would allow different counts for different choices.

I think for now, let's handle the common case of a fixed count per object. @redrn says something about a default base count, so maybe editpart --count should change that?

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