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1715.1

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rsetaluri 
Initial implementation of new style class definition syntax

This is a first pass attempt at a "new-style" class definition
syntax for magma circuits.  This removes the requirement that the user
specify the definition inside a `definition` classmethod. Instead,
the user constructs an `IO` object with the interface and then performs
the desired wiring operators to define the circuit.

The `IO` object constructs a set of anonymous values to be used for the
ports.  The circuit definition is defined in terms of the anonymous
values.  These changes add a final stage to the metaclass `__new__`
logic defined in the method `process_new_style_definition`.

The `process_new_style_definition` method constructs an "old-style" IO
list (e.g. `["I0", m.In(m.Bit), ...]`) and passes this to the old logic
for setting up interfaces (`DeclareInterface`).  This required the
minimal amount of changes to the existing code, although we may consider
rearchitecting the entire interface pipeline given this opportunity.

Because we use the old-style interface setup logic, we must traverse the
definition graph defined on the temporary anonymous values setup by the
`IO` object and replace the anonymous interface values with the concrete
values from the old-style interface setup logic.

`process_new_style_definition` also traverses the definition graph and
"places" the instances (by using `self.place`) within the current
definition.

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Source Files on job 1715.1