Replace the screenshot usage in framework test (#11547)
- Replace the GridDisabledTest screenshot usage
- Replace the screenshot tests in BasicCrudGridEditorRowTest
- Replace the screenshot tests in ComboboxVaadinIcons
- Replace the screenshot tests in ValoThemeUITest::accordions
- Added screenshotcomparetolerance to some screenshot test to make tests stable
* Updating Chrome version to 69
* Updating screenshots taken in Chrome 69
* Fixing screenshots
* Fixing screenshots
* Adding some wait commands to tests
* Fixing screenshots
* Revert: Fixing screenshots
* More screenshots
* - Adding wait commands to make sure the transitions end before screenshot
- Fixing a screenshot
* Correcting a mistake of using wait instead of sleep
* Fixing more screenshots
* Increasing the height of ContextMenu (Because of limitation of new Chrome 69 in terms of minimum window height, ContextMenu size can't be tested with a small height.)
* Fix TestBench API imports, move functionality from custom elements
* Fixes to TestBench APIs and JavaDocs
* Merge remote-tracking branch 'origin/master' into 578_tbapi_cleanup
* Fix method name in CheckBoxGroupTest
* Remove unused custom element classes
* Implement getOptions using getOptionElements
* Replace setValue with setSelection in CheckBoxGroupElement
* Rename CheckBoxGroupElement getSelection to getValue
* Fix one last method