wf_monitor to use new amqp_helpers setup; updated wf_monitor tests;
updated WorkflowEventSchema to accept a string in the timestamp field
instead of a datetime (we could probably change this, but this is how
it's set up for now)

originally going to use a singleton pattern but ran into issues with
that)

all necessary fields have been updated to reflect naming changes

Hopefully final changes to setup.py files regarding package name changes; renamed a amqp_helpers dir to channels

Made amqp_helpers directory structure match the other subprojects. Made some small changes to monitor.py and test_monitor.py

Added __str__ and __repr__ methods to WorkflowMonitor; small updates to same methods in WorkflowEvent

SSA-6324: refactored prop setter for testability and created tests; added script to run all tests in data repo

SSA-6324: Tests are tightened up and more efficient; pylint is (somewhat) mollified; optimizing them flushed out a bug or two in the updater.

SSA-6324: datafetcher tests proceed as expected in IJ and at command line, but not in Docker container. scode_updater tests proceed as expected in IJ, but not at the command line or in Docker container. Requirements updated; convenience script added for rebuilds.

SSA-6324: schema init adds convenience methods suggested by Thomas; Project how has authors cascade; deploy requires Python 3.8; a project updater test now requires pytest-mock; updater and datafetcher tests complete, and most exercise CLI