Filtering should remove values from arrays

[gsouf]

we should be able to easily add filters to remove data that dont belong to the form. Filltering data aims to make them 100% relevant.

The idea would be to implement this in the builder. Then every element added by the builder would have a filter StrictField to be added automatically.

Consider a form containing firstname and lastname inputs.

We expect the following data :

[
    firstname: "bart",
    lastname : "simpsons",
    age : 12
]

to become after filtring :

[
    firstname: "bart",
    lastname : "simpsons"
]