Support dat.json

[joehand]

• Read and write dat.json files
• Validate existing files
• Update keys found in dat.json if keys don't match.

See dat-json in dat-next for partial implementation. Also check out what is going on in beaker.

[okdistribute]

Started it here https://github.com/datproject/dat-node/pull/122

[millette]

For reference https://github.com/datprotocol/dat.json

[joehand]

I created https://github.com/joehand/dat-json. I think the only thing missing there is also an option to write to the file system and integrating it here/cli/desktop.