tweedledum v1.1.0

In this release there was many cosmetic changes, such as using clang-format on
all sources and restructuring the project's directory to more closely follow the
pitchfork layout conventions.

Added

• Analysis pass to count operators.
• Analysis pass to compute instructions' ALAP/ASAP layers.
• Analysis pass to compute critical path.
• Analysis pass to cut circuit.
• Gate cancellation pass.
• Pass to inverse (take adjoint) of a circuit.
• Crude QASM 2.0 parser.
• CX-Dihedral synthesis method.
• Bridge operator.
• Bridge decomposition pass.
• Bridge mapping pass.
• Sqrt(X) operator.
• TFC parser.
• Allow user to define var order for expressions.
• Limited support for arm64, ppc64le and s390x.

Change

• Rename depth pass to compute_depth.
• Restructure of the code base.
• Make Cbit, Qubit, and Instruction constructors public.
• Invalidate ancilla reference on release.
• Change Unitary operator global phase behavior.
• Rename euler_decomp to one_qubit_decomp.

Deprecated

• Circuit size() method. (Use num_instructions instead.)

Fixed:

• Operator must clone the ConcreteOp class on copy.