Refs #4739, remove need for explicit wait time values on page reload/change & refactor test runner.
Refs #4739, specify tests to run via test name not test file name.
Refs #4739, follow BDD style file naming convention, load screenshot test files recursively and look in plugin test dirs for UI tests as well as the UI test repo.
Refs #4739, rename suites to use BDD-style naming convention and move to specs folder.
Refs #4739, fix bug in test loading logic (skip .. & . files when loading plugin dirs).