methods based on the architecture diagrams; copied null capability
implementation from wksp0

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)

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 event_catcher.py with some notes on design and amqp_helpers.py, which contains some helper functions for AMQP-related procedures

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

Implemented parsing of setup.py files within a buildout recipe; next is to generate meta.yaml files for each setup file parsed