Make create-field and create-display to generate templates

Make a `gradle create-field-widget default/type` which will create a `_widget.gsp` in `views/_fields/type`, a `gradle create-field-widget pkg.Foo.prop` which will create a `_widget.gsp` in `views/foo/prop` by interrogating the domain class.

Make `gradle create-field-wrapper`, `gradle create-display-widget` and `gradle create-display-wrapper` that does the same thing for `_wrapper.gsp`, `_displayWidget.gsp' and `_displayWrapper.gsp`

Start with the Gradle entry points for create-field-widget, create-field-wrapper, create-display-widget, and create-display-wrapper. Compare the requested output paths under views/_fields/type and views/foo/prop, including domain-class interrogation for pkg.Foo.prop. Done means each command generates its corresponding GSP template in the requested location.

Written by the indexing model from the issue text.