[iOS] Add a permanent wrapper around ImageButton so it works with our various behaviors

[PureWeen]

Description

With this PR we set ButtonHandler to always have a wrapper view in order to facilitate loading behaviors. We should have set ImageButton to always have a container as well.

Because of how iOS works we can't inherit from UIButton so we have to come at it from different angles.

This should resolve issues where ImageButton isn't reliably firing Loaded events