Rgrow

- Initial 1D SDC support.

- Significant change in Python organization: there are now model-specific System class, rather than one System class. Tileset definitions will return a specific class, and classes should eventually be able to be created directly. This should make it much easier to add ways to view and manipulate system objects in model-dependent ways.
- Improvements to Python docstrings and type stubs.
- Numerous code rearrangements for Python.

- Improvements to FFS code organization.
- Support for writing FFS results to files.
- Improved FFS polars dataframe output creation:
- configs now include tracking information, if present.
- configs no longer breaks if keep_configs is false (shows last configurations)
- Fix Python mismatch display code (some mismatches were not shown).

- Start order tracking at 1 (0 is a site that was never filled).
- Added LastAttachTime tracker: keeps track of the last attachment/change event in a location.
- Added PrintEvent tracker for debugging, which prints every event.
- Implement dimer chunk detachment properly for kTAM model (already in oldkTAM).

- Fix dimer formation rates in kTAM model.
- Fix k_f specification in kTAM model.

- Allow state references to be cloned into normal states (useful for FFS results).
- Add Python typing for FFS results.
- Distinguish stored states and number of configurations for FFS surfaces.
- Make FFS state references more useful.
- Fix rayon use in Python (parallel execution).