Pysdm

- single-column environment and examples beef up (kudos sajjadazimi)
- improved aerosol initialisation test coverage (kudos claresinger)
- API change in aerosol initialisation (aerosol.aerosol_modes -> aerosol.modes)
- JOSS v2 paper progress

- handling of domain-leaving particles in displacement logic and 1D kinematic smoke tests updates (thanks to sajjadazimi)
- more tests for CCN activation (thanks to claresinger)
- code cleanups (including enforcing keyword parameters for functions with many args)

- common aerosol composition code in `PySDM.initialisation` (claresinger)
- breakup: counting breakup deficit instead of reporting error, `vmin` and `nfmax` thresholds (edejong-caltech)
- Area attribute and `SimpleGeometric` collision kernel (edejong-caltech)
- `NumberSizeSpectrum` and `BreakupRateDeficitPerGridbox` products (edejong-caltech)
- adaptive time-stepping in `Displacement` dynamic (criterion suggested by mwest1066)
- `Feingold1988Frag` fragmentation function (edejong-caltech)
- renaming default branch from `master` to `main`

- new example reproducing CCN activation figures from Abdul-Razzak & Ghan 2000 (kudos to imdula, claresinger & trontrytel!)

- add black, isort and precommithooks code maintenance helpers (kudos jb-mackay!)

- fix in collision dynamics ctors solving problem with undefined random seed on the GPU backend (thanks s-shima for reporting it)
- cleanups and new smoke tests for CCN activation representation (thanks claresinger)
- CI: add job cancellation workflow for GitHub Actions (thanks claresinger)