Rapid React: JSON storage

[TheAnnalyst]

This is a low-priority issue; the production scouting website uses SQLite, and if I can find people who are willing to learn/be taught SQL I'll probably deprecate the JSON storage system anyway. However, if someone's looking for a project to get more familiar with the scouting library codebase, you could implement a class RapidReactJSON implements JSONStoragePlan<RapidReactMatch>. (As with SQLite, looking at Infinite Recharge should give you an idea of how it should be done.)