This adds two new admin settings to the theme appearance options.

Shows the lang menu in secure layout, langmenuinsecurelayout.
Shows the user's name in secure layout, logininfoinsecurelayout.

When the page layout is set to secure, these options will be in effect.

Ryan Wyllie authored May 14, 2019 and Simey Lameze committed May 07, 2020

I've modified the Google Drive portfolio export so that it creates a
root directory in Drive for all of the files in the export. This allows
each export to be contained from each other to help with clashing file
names.

Additionally, the paths for the exported files will now be created in
Drive so that exported files are in the correct directory structure.
This is important for forum posts exports which assume a certain
directory structure in the export.

There are some changes to make this possible:
- Enable by default the Mobile notifications plugin
- Implement a new callback for core -> plugins communication
- Generate an Airnotifier access key in the callback when needed

In fact, rather than fix the old logic, I noticed that the correct
logic was already implemented in get_users_by_capability. So, I
refactored to extract the working version into a function, which it
turns out can have exactly the same API as get_with_capability_join,
which was convenient.