Provide additional HtmlInputType's for checkbox, radio and file

[ingogriebsch]

The custom Hypermedia implementation for Siren provides a similar approach to deal with html input types as Spring HATEOAS in version 1.3.

To unify the approaches and to ease the usage for clients it would be really helpful if Spring HATEOAS could add HtmlInputType's for datetime, checkbox, radio and file.

Enhancing the InputTypeFactory to also handle these type's as much as possible would be the cream on the cake! :)

[odrotbohm]

That's certainly something we can explore. That said, this of course raises a couple of questions that I'd like to discuss in person. I'll ping you on Gitter. 🙃

[odrotbohm]

That's in place now, feel free to give the snapshots a spin.

[ingogriebsch]

Great! Many thanks, @odrotbohm ! :)