[Refacto-557] Button: Add UIControl

[robergro]

• Add UIControl on Button
• Deprecate old var, func and init
• Add setImage, setTitle, setAttributed methods
• Override isSelected, isEnabled and isHighlighted var
• Update the demo
• Update the Wiki

[michael-zimmermann]

Two things I saw in the demo app:

• When the state is just icon, the trailing spacing seems to be bigger than the leading spacing
• When the state of the highlighted content is just text, the icon is still shown. This is the same for disabled and selected.
  
  

[robergro]

Ooo Thank you @michael-zimmermann ,
I sent a new commit.

It not solve everything but it's better.
Currently, the visibility of the label and icon is manage by the view model but it's very hard to manage all state with the viewModel too I think.

So now, we can have a problem if the button has just an icon (on normal mode) and image + text (on highlighted mode) because the size of the button is a square.

This is why i need to split the component to:

• Button
• IconButton (always square, withtout title)
• Toggle Button

And I hope with that, all our problems will be solved.

[LouisBorleeAdevinta]

I'll need a bit more testing, to continue :)