issue-2553 Fix success message on profile edit and logout on password…

[Sidsector9]

Related #2553

Description

• Change of first_name, last_name, display_name or email will output a success message as:
  Your profile has been updated.
• Changing only the password will output a success message as:
  Your password has been updated
• Change of both of the above will display a success message as:
  Your profile and password has been updated.
• Change of password will logout and redirect to the current page with a success message corresponding
  to the type of change.

How Has This Been Tested?

This has only been tested manually by first updating profile, then only updating password, and then updating everything all at once.

Types of changes

Previously, on successfully updating the profile, the page redirected to:
http://give.local/profile-editor-shortcode/?updated=true

Now the page redirects with an additional query string parameter:
http://give.local/profile-editor-shortcode/?updated=true&update_code={number}

Where {number} takes values:
0: No change
1: Profile change only
2: Profile and password change
3: Password change only

Checklist:

• My code is tested.
• My code follows the WordPress code style.
• My code follows has proper inline documentation.

[DevinWalker]

First PR! 👍