Trait refactor

[xQwexx]

Hi @artf
I am working of refactoring of the Trait module because I wanted to build some custom input layouts but there was not existing generic ones that I could use, so I started to work on a generic InputViews (Backbone model attribute modifiers),
this would also enable to use it instead of PropertyView, TraitView and InputView so it will be much easier to maintain and understand

To a more reusable which would not depend on the component and trait to be a backbone model:

But I think this would require to break the current API for the Traits in some places, so I wanted to know what do you thinks of this before I do a clean pr (so this is a WIP branch of mine with some unrelated changes)

      let input = new TraitTextView(em, { name: 'route' })
      input.setTarget('name', this.model, { changeProp: true });
      this.$el.append(input.render().el);