Cassiopeia 2.0.0

This release is for a refactored Cassiopeia codebase that includes most of the features in the original codebase and more.

Among the key improvements are:

1. A more flexible preprocessing pipeline, amenable to other lineage-tracing technologies (e.g., GESTALT)
2. A more streamlined & pythonic reconstruction framework, deriving from the CassiopeiaSolver class. This class is easily extendable for future development.
3. Several new algorithms implemented - for example distance-based solvers like UPGMA and graph-based solvers like MaxCut and Spectral partitioning.
4. A new and improved benchmarking suite that allows for sophisticated topology and lineage-tracing simulation. In this, we have also added nuanced simulators for sampling cells, for example to simulate spatial assays.
5. An improved CassiopeiaTree class for efficient tree manipulation and integration with transcriptomic and meta data.
6. Improved logging throughout.

All documentation, and tutorials are available on our documentation website here.

Any issues can be filed here.