PHP8 and WP5.6 Compat

[thomasplevy]

Add-on Checklist

• Composer Updates

  • lifterlms/lifterlms-tests
    • [x] Switch from "dev-master" to "dev-trunk"
    • [x] Update to latest version
  • lifterlms/lifterlms-cs
    • [x] Switch from "dev-master" to "dev-trunk"
    • [x] Update to latest version
  • Scripts
    • [x] Update scripts to match the LifterLMS Core scripts block
    • [x] Ensure any custom scripts are retained
    • [x] Ensure database scripts use a custom default database name, eg "llms_groups_tests" instead of "llms_tests"
    • [x] If the add-on is not configured for E2E testing the "env" and "env:setup" commands can be removed
  • PHP Requirements
    • [x] Update PHP version to be >=7.2

• Travis Config Updates

  • [x] Update to import the add-on.yml config from the LLMS core.
  • [x] Import the e2e config if the add-on is setup for e2e testing
  • [x] Retain any custom jobs specific to the add-on

• Tests

  • [x] Test Suite Passes in Travis
  • [x] Passes manual inspection on php8

[thomasplevy]

Manually tested everything with no issues (dev branch).

Since the test suite basically covers nothing and is just a base for adding tests to later we cannot really trust it but I'm pretty confident we're okay after manual testing and code review.