datdot app: settings json editor

[serapath]

@todo

• [ ] implement json editor

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inspiration

• http://rlidwka.github.io/jju/editor.html
• http://jeremydorn.com/json-editor/
• https://rawgit.com/jdorn/json-editor/master/examples/basic.html
• https://rawgit.com/jdorn/json-editor/master/examples/advanced.html
• https://rawgit.com/jdorn/json-editor/master/examples/css_integration.html
• https://onlinejsoneditor.com/
• https://codedestine.com/json-editor.html