Merge branch '2021-04-07-cleanup' into 'master'

deprecated/SDP/SDP/__init__.py

deprecated/SDP/SDP/__main__.py

deprecated/SDP/SDP/opcua_connection.py

deprecated/SDP/SDP/release.py

deprecated/SDP/SDP/wrappers.py

deprecated/SDP/requirements.txt

deprecated/SDP/setup.py

devices/PCC.py

devices/SDP.py

devices/__init__.py

devices/clients/opcua_connection.py

devices/clients/test_client.py

devices/examples/HW_device_template.py

devices/setup.cfg

devices/test_device.py

devices/util/archiver.py

devices/util/attribute_wrapper.py

devices/util/comms_client.py

devices/util/get_internal_attribute_history.py

devices/util/hardware_device.py