v0.13.2

This is a performance and bugfix release.

The main bug was in the caching infrastructure, where deletions that occurred after a significant gap in the history of entity existence would not be recorded correctly.

There are some performance improvements as well, particularly in ELiDE, where it's now possible to run a sim for longer than twenty turns without ELiDE stuttering to a halt. 

As always, you can install LiSE and ELiDE into your own Python installation with

`python -m pip install LiSE ELiDE`