Qlasskit

What's Changed
* int and float cast functions by dakk in https://github.com/dakk/qlasskit/pull/25
* Type refactoring by dakk in https://github.com/dakk/qlasskit/pull/40
* Shift and Add multiplication by dakk in https://github.com/dakk/qlasskit/pull/41
* Improvements and refactoring of the internalcompiler
* Optimization of the tweedledum compiler


**Full Changelog**: https://github.com/dakk/qlasskit/compare/v0.1.19...v0.1.20

What's Changed
* Qfixed type by dakk in https://github.com/dakk/qlasskit/pull/20
* Make qint a generic type by dakk in https://github.com/dakk/qlasskit/pull/24
* Minor improvements and refactoring


**Full Changelog**: https://github.com/dakk/qlasskit/compare/v0.1.18...v0.1.19

- Decompiler and optimizer improvement
- Test coverage for decompiler

**Full Changelog**: https://github.com/dakk/qlasskit/compare/v0.1.17...v0.1.18

- Fix bug 9
- Docs improvement
- Qchar type
- Update test and notebooks for qiskit 1.0

- Introduce `Qint5` and `Qint6` types
- Fix original_f creation for parameterizable functions

- binary quadratic model exporter for qubo, bqm and ising models
- minor fixing