Actually, it might not be a good idea to allow for the entire upgrade process to be done through the command line. The issue is after new files are transferred, PHP must terminate and re-run so the updated files can be loaded into runtime.

Instead, let's just focus on making the database upgrade step available through the command line. But since v11 files would have already been transferred by this point, we can ignore implementation in v10 and just focus on v11.

Also add the ability to import and upgrade non-bundled addons through the command line.