docs(server-setup): clarify that seleniumAddress overrides sauceUser/sauceKey

Closes #1457
docs(faq): add question and answer for debugger not pausing
chore(plugins): adjusted the way plugin paths work + added tests
feat(plugin): allow plugings to return test results
fix(clientsidescripts): make findByCssContainingText tolerate elements with no textContent/innerText