convenience init() across the framework prevents generic initialization of the components

[OrkhanAlikhanov]

All of the following convenience initializers that are defined for UIView subclasses are redundant.

public convenience init() {
  self.init(frame: .zero)
}

With or without it, we can create object of UIView and its subclasses. Adding it actually causes a problem for their use in generic initialization
For example TextField().

[daniel-jonathan]

Let's remove them. Great find.

[daniel-jonathan]

I merged in the PR. I will close this now. Thank you!