Use json schema for project file validation

[nmerket]

Is your feature request related to a problem? Please describe.

It's been over a year since Yamale was updated.

Describe the solution you'd like

JSON and YAML are functionally the same, just syntactically different. By switching to JSON Schema for validation, we could have more robust validation rules.

Describe alternatives you've considered

If it ain't broke don't fix it.