Badges upgrade step should not require lib/badgeslib.php

The one function that is required for new installs and upgrades is badges_install_default_backpacks() which creates the backpacks:

• https://backpack.openbadges.org
• https://badgr.io

This function does not do any custom logic, it just makes DB queries to insert the backpacks using constants. Those constants and the function should be split into a separate location so they can be called during install/upgrade without loading the rest of the badges functions / constants.