* Setup changesets and the changesets GH action
* Lower package versions so changesets can bump them
* Add changesets for all changes on the `modularization` branch
Co-authored-by: Josh de Leeuw <josh.deleeuw@gmail.com>
Co-authored-by: Becky Gilbert <beckyannegilbert@gmail.com>
* Convert jsPsych and plugins to ES6 modules
* Create packages for each plugin, the core library, and config files
* Setup rollup, jest, and babel configurations
* Update jsPsych to load plugin objects directly from the `type` field
* Update tests to use the ES6 modules
