Adding support for Palmsens and cyclic voltammetry

[ml-evs]

We (@gahorwitz and I) would like to support the Palmsens cyclers. They are bluetooth-connected so can be used directly inside a glovebox. Some more info:

• They have only one channel
• The software they require is called PSTrace (non-free) which also has a PythonSDK (semi-free, requires PSTrace to run).
• It supports various techniques, CV, EIS, etc.
• Currently people open their data in PSTrace as a "session" and then export the relevant parts to .csv or Excel files.

Plan of action:

• [ ] Support reading the .csv-like format provided in a Palmsens export. Results are broken down by technique, with various magic bytes and headers separating each run.
• [ ] Tweak the existing echem block to support this file type, and make sure that plotting still works in the case where there is no capacity info (i.e., only CV).
• [ ] Write a more complicated reader of the overall psession file, which contains all relevant metadata on cycling protocols, rates etc, and use this to construct an echem block that can use this considerable extra metadata.
• [ ] Final goal would be being able to upload a single file from the cycler and plot a rate-dependent CV

[ml-evs]

And potentially backup files from @jdbocarsly, which are written during measurement before the CSV