Pcdsdevices

Features
--------
- Add a bunch vacuum-related classes for L2SI

Misc
----
- Fix an issue with the doctr deploy key

Same as v2.1.0, except it will correctly upload itself to the conda channel

Features
--------
- Add ``screen`` method to ``PCDSMotorBase`` to open the motor expert screen
- Add tab completion filtering via whitelists as the first feature of the
``engineering_mode`` switch. This was implemented because the tab
completion on ophyd devices is extremely overwhelming.
Use ``set_engineering_mode(bool)`` to turn ``engineering_mode`` on or off.
The default is "on", which means "everything is normal".
Turning ``engineering_mode`` off enables the whitelist filtering,
and in the future may also have other effects on the user interface.
- Add ``dc_devices`` module for components from the new DC power system.
This currently contains the ``ICT`` and related classes.

Misc
----
- Fixed a race condition in the tests
- Clean up the Travis CI configuration
- Pin pyepics to >=3.4.1 due to a breaking change from python 3.7.6

Features
--------
- Add ``gauge`` and ``pump`` modules
- Add ``Acromag`` and ``Mesh`` classes
- Add ``motor`` subdevice to state record devices
- Add ``status`` string to ``BeckhoffAxis``

API Breaks
----------
- State devices no longer have the ``readback`` signal, as it is redundant
with the new ``motor`` subdevice
- ``PCDSDetector`` has been renamed to ``PCDSAreaDetector`` for clarity.
``PCDSDetectorBase`` is also renamed to ``PCDSAreaDetectorBase``.

Bugfixes
--------
- Fix PVs in ``BeckhoffAxis``

Misc
----
- Officially build for ``python=3.7``

Features
--------
- Add all common plugins to ``PCDSDetector``
- ``EventSequencer`` now accepts human-readable sequences

Fixes
-----
- Fix debug PV names in ``BeckhoffAxis``

Misc
----
- Add a py37 build to the CI
- Remove outdated hotfix for ``FakeEpicsSignal`` in tests
- Fix misc testing errors

Features
--------
- Support for reading and writing sequences to and from the ``EventSequencer``
- Add ``Motor`` factory function for choosing which motor class to use based
on the text in the ``prefix``.

Bugfixes
--------
- ``IMS`` class will no longer get its ``.SPG`` field stuck on ``paused`` or
``stopped`` when a scan is interrupted. Scans will start even if these
fields are blocked.
- Update out-of-date ``requirements.txt`` file for ``pip``
- Pin ``matplotlib`` to ``<3`` to avoid import incompatibility pitfalls, and
confine the ``matplotlib`` imports to function scope instead of module scope
to avoid having a backend be set on import.