Pcdsdevices

The module has been reworked for the `hutch-python` project. The code is much cleaner, and we expect it to perform better. Many features have been removed. There is not a chance that this is directly compatible with older versions. There are definitely bugs. More cleaning can be done. Treat this as an api-breaking pre-1.0.0 release.

We are not committing to a 1.0.0 release in case the scientists dislike it and we have to make major API changes.

Everything is in working order with the `ophyd=1.0.0` dependency. We expect that no more changes are needed for `skywalker` to function properly. The library is not quite mature enough for a v1.0.0 release.

Release tag right before pulling in the update that makes our repo compatible with ophyd 1.0.0