Circuit Viz Improvements

[ScottCarda-MS]

Some internal cleaning of the circuit visualization code:

• removes ConditionalRender from circuits as that is for the now defunct classical conditional rendering.
• removes GateType.ClassicalControlled as that was also for the defunct classical conditional rendering. This was replaced by merging conditional groups into GateType.Group rendering.
• removes the data-attribute "zoom" and now treats GateType.Group as expandable/collapsible.
• collapsed gate groups are now still treated as GateType.Group, just with their "expanded" data-attribute non-true.

This has the additional effect of allowing classically controlled groups to be expandable/collapsible, which makes for a more conceptually consistent pattern for users.