Mappings 2.0

[nonhermitian]

This PR changes the way the final measurement mappings are computed so that they allow for repeated qubit measurement, e.g. as allowed by mid-circuit measurements / dynamic circuits. Previously the mapping dicts had qubits as the keys and bits as the values. However, mid-circuit measurement allows for the same qubit to be measured multiple times to different bits, and thus qubits cannot be used as key values in a dict.

This is a breaking change, which is why the version was bumped, #132, as we are keeping the same dict class for the mapping, and thus users inputting the mappings by hand would need to change their dict form.

Things left to do

• Add dynamic BV test
• Update docs

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