Feature/rewrite with schema types and parsers

[xddq]

Summary

Used the fully types JSONSchema draft v7 types to basically rewrite the logic. Edge cases which were not implemented and/or incorrect were now added. E.g. Type.Union() via list of types for "type" attribute. Or Type.Unknown() for object without properties. Some more tests still should be added, since most cases were caught by typescript type issues rather than the tests.

• bumps official support to JSONSchema draft v7 similar to match what typebox has done.
• adds linting to the project (linting was disabled for intial version)
• will become version 1.6.0

[xddq]

perhaps the rewrite also fixes some of the issues you faced @pdfowler

Keeping the pr open for a little while, in case you want to check it out