Update Python interface #83

The current python interface requires the movement of data from Rust to python that is not required.
The more complex data structures should remain in rust and not be accessible from python at all unless specified.
Additionally, the API of the Rust structures should not require PyCommands or an intermediate "Circuit" language

This PR will:

• update python bindings to dependence on a PyCommand
• extend bindings to allow the passing of synthesis type
• avoid passing Rust data to Python unnecessarily