Rastermap

paper now out: https://www.nature.com/articles/s41593-024-01783-4

Fixes 31 and adds support for phy files (`spike_times.npy` and `spike_clusters.npy`)

Fixes some bugs and adds all code for new figures

Release with biorxiv paper: https://www.biorxiv.org/content/10.1101/2023.07.25.550571v1

* pip no longer installs pyqt - expects user to use environment.yml file
* added autogrid drawing
* added DBSCAN clustering to rastermap