Inconsistent messaging definitions used

[billglover]

It isn't clear which messaging formats are used when sending messages between functions. An example of this inconsistency is shown below:

• actionHandler() to msgFlagger() uses a message format defined in the slack package.
• msgFlagger() to msgSender() uses a message format defined in the messaging package.

The original intention was to use an internal messaging format to avoid some of the complexity that comes with being tied to the Slack messaging format. The reality is that all of the internal messages closely resemble the Slack messages and confusion arises as to which format is used.