This PR does 2 things:

• It standardizes the naming of some static properties so that they start with a lower case character (ref: https://swift.org/documentation/api-design-guidelines/).
• It implements / fixes Site Creation: Fix deep linking in first-post congratulations email. #11693.

Details:

This PR implements the code to handle /mbar redirects, such as:

https://public-api.wordpress.com/mbar/?redirect_to=https%3A%2F%2Fwordpress.com%2Fpost%2Fddancestore.wordpress.com

We've also added an AASA file to public-api.wordpress.com (ref: pMz3w-a0N-p2).

Dependencies:

This PR has a dependency on: #11851

Matching Android PR:

wordpress-mobile/WordPress-Android#9957

Testing:

Make sure you erase all content and settings from your simulator before testing. This ensures the newly installed App picks up the AASA file from public-api.wordpress.com.

Test 1:

1. Create WP.com site.
2. Publish a post in that site.
3. Check that you received the "Congratulations on your first post!" email for the new site.
4. Tap on the blue "Start a New Post" button.
5. Make sure the editor is opened in-App.

Test 2:

1. Launch the app.
2. Make sure you're logged in.
3. Enter this in a terminal window after replacing the blog name: xcrun simctl openurl booted https://public-api.wordpress.com/mbar/?redirect_to=https%3A%2F%2Fwordpress.com%2Fpost%2Fdiegotest4.wordpress.com
4. Make sure a new post is created in the App for the specified blog.

Additionally you can place breakpoints here to make sure the full URL is tracked, but the final redirect isn't.

Update release notes:

• If there are user facing changes, I have added an item to RELEASE-NOTES.txt.