Display a spacer cell instead of TOS when host apps remove the link to WP.com terms of service.

[ctarda]

Closes #543
Ref: woocommerce/woocommerce-ios#3309
Ref: woocommerce/woocommerce-ios#3330
PR in WooCommerce: woocommerce/woocommerce-ios#3339

The way I implemented the removal of the TOS was by just removing the cell from the table view. That makes the bottom hairline in the email textfield cell to sit right above the top margin of the Continue button.

I considered just hiding the TOS button instead of removing the cell completely (you can see that if you look at this very PR history) but in the end I thought a Spacer cell (a completely empty one) might be a better way to handle this.

Changes

• Add a spacer cell
• Declare a new section in GetStartedViewController to model the spacer
• Check if the host app wants to display TOS or not. If it doesn't, add a spacer.

How to test

• Look at the code. Does the change make sense?
• Check that the corresponding PRs in WooCommerce and WordPress work as expected.

• WooCommerce: Add padding between email and Continue button woocommerce/woocommerce-ios#3339
• WordPress: Test WPAuthenticator's update to handling of display of TOS WordPress-iOS#15486

[mindgraffiti]

I think you will want to un-check User Interaction Enabled for the spacer cell, otherwise VoiceOver will attempt to identify it. I'm unable to test and confirm this claim because my device isn't registered for Woo use.

Other than that, !

[ScoutHarris]

Since the new release was cut today, this should probably be 1.32.0-beta.1 after @jkmassel finishes the releases.

[ctarda]

Thanks @mindgraffiti @ScoutHarris I'll merge develop into the branch, un-check userInteractionEnabled, update the podspec and merge 😊