Implement the fields/no-fields options.

Remove a bunch of methods that will not be used in the future.
Update validation generation to be simpler.

Removing the interactive mode makes generating validation rules
simpler.
Remove tests for methods that don't exist anymore.
Update behavior generation and some internals.
Janky poorly spaced version of validation generation is working.
Add more meat to Table baking.

The template is gross because native PHP's whitespace handling is not
very good. Hopefully the alternate syntax can make things a bit eaiser
to work with.
Basic template and functionality for baking entity classes.
Fix typos and missing boolean flags.