preparing for the ganda 1.0 release

[tednaleid]

This PR refactors most of the guts of ganda.

The biggest changes are how it deals with the bodies of requests and responses.

It now allows for JSON-lines to be streamed to ganda that includes details about the desired request, and can emit bodies with different formatting.

The docs/GANDA_TOUR.ipynb notebook has many details about the updated functionality.

Breaking changes include:

• previously experimental switches have been removed
• previous body template code has been eliminated in favor of having other tools stream JSON bodies to ganda