Support for larger n>2 gates

[lsschmid]

As NAs natively support multi-qubit gates with more than two qubits, supporting the corresponding gates (in particular, CCZ and CkZ) would be nice. For the animation, one could use the same effects as for CZ, just acting on all qubits that take part in the gate.

Tasks to do

• Modify parser/file format to support larger gates
• Modify architecture configuration to load gate times/fidelities for larger gates
• generalize CZ animation to support larger gates

[lsschmid]

File format and animation added as part of #65