Qutip-qtrl

This is a patch release of qutip-qtrl that provides updates to support the QuTiP 5.0.0a2 release.

Bug Fixes
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- Fixed progress bar initialization and usage (13, 15, Patrick Hopf).
- Replaced the logging utilities that were removed from QuTiP v5 with a vendored copy in this package (9, 10, Èric Giguere, Boxi Li).
- Applied black to setup.py and doc/conf.py scripts (8, Simon Cross).

This is the first release of qutip-qtrl, the quantum control package in QuTiP.

The qutip-qtrl package used to be a module ``qutip.control`` under [QuTiP (Quantum Toolbox in Python)](http://qutip.org/index.html). From QuTiP 5.0, the community has decided to decrease the size of the core QuTiP package by reducing the external dependencies, in order to simplify maintenance. Hence a few modules are separated from the core QuTiP and will become QuTiP family packages. They are still maintained by the QuTiP team but hosted under different repositories in the [QuTiP organization](https://github.com/qutip).

The qutip-qtrl package, QuTiP quantum optimal control, aims at providing advanced tools for the optimal control of quantum devices.

Features
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- The `cy_grape_unitary` optimizer now uses the QuTiP 5 data layer directly and no longer requires Cython. The `cy_grape` module remains available for compatibility, but also no longer uses Cython.

Bug Fixes
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- The `grape_unitary_adaptive` optimizer previously overwrote the target unitary with the identity. It no longer does this.