Major release, new update_params and reset_payload features

Major release, new update_params and reset_payload features along with many bug fixes, significant refactoring, and many added tests opening the package for better communal development.

Persistable - persist and log experiments while tracking full parameter lineage.

Many new features since the last release, including post-generate/load scripting, and load-generate functionality to automatically generate payload when they don't already exist.

Direct persist method added to Persistable class

The direct persist method allows users to persist changes made to the payload on the fly without running the entire generate function (which can be costly).