Make sure each plugin's plugin.json is valid #7
Description
BuildFire plugins have plugin.json files that describe them, sort of like package.json files.
I'm not entirely sure what the composition of these should be; right now they're a mix of boilerplate and guessing. We should fix!
Reference: https://github.com/BuildFire/sdk/wiki/How-to-Fill-in-%22plugin.json%22-File