Improved Sizes setup

This release simplifies the way to use Sizes in your apps. Huge thanks to @b-onc for this one!

Scale the contained view and extra features

A new extra features Sizes was missing:

• Scale the contained view when viewing larger devices.
• Hide the orientation section if the app supports only one orientation type.
• Set the devices available for your particular app.
• Added accessibility identifiers to every element to run UITests with Sizes.