LDEV-2372 testing framework
* a lot of refactoring
* constants moved to separate class
* when we get verification error(s) Selenium server shuts down correctly now
* fixed random assertion failures by setting minimum Selenium speed to 400ms (can't be decreased)
* added assertions to the createNewLesson method
* fixed problem with saving learning designs with the same name
* receiving workspaceFolderID from DB now