Alpaqa

- Intermediate development release

**Full Changelog**: https://github.com/kul-optec/alpaqa/compare/1.0.0a6...1.0.0a7

- New type-erased problem formulation
- PANOC solver specifically for optimal control problems
- Gauss-Newton accelerator

**Full Changelog**: https://github.com/kul-optec/alpaqa/compare/1.0.0a5...1.0.0a6

- Python: Support releasing the GIL during solve, allowing thread parallelism and handling KeyboardInterrupt.

**Full Changelog**: https://github.com/kul-optec/alpaqa/compare/1.0.0a4...1.0.0a5

- Complete ProblemTrampoline Python interface
- Flush after printing solver progress

**Full Changelog**: https://github.com/kul-optec/alpaqa/compare/1.0.0a3...1.0.0a4

- Change default value of `ALMParams::max_*_num_retries` to zero
- Add `final_γ` statistic to PANOC

**Full Changelog**: https://github.com/kul-optec/alpaqa/compare/1.0.0a2...1.0.0a3

**Full Changelog**: https://github.com/kul-optec/alpaqa/compare/1.0.0a1...1.0.0a2