Data binding

[andyexeter]

This PR implements the ability to bind data (objects and arrays) to forms.

Keeping as a draft for now as there are still a few more bits to do and then some testing will be required.

Resolves #5

[Virgilio123]

Can I install the new version with composer ?

[andyexeter]

You can, but I wouldn't recommend it just yet:

composer require palmtree/form:dev-data-binding

Please don't use this in production. It's a development branch that hasn't been fully tested :)

[andyexeter]

@axoloth @Virgilio123 I believe this is ready for merge now.

Any chance you are able to test this for me?

[andyexeter]

I've changed the implementation here slightly.

You can now pass any object instead of having to implement an interface and (optionally) use a trait, with the data mapping logic being extracted into a service class.