Webdriver and paste action updates

[ferpasri]

WebDriver updates

• Use scroll-snap-type to ignore scroll actions in carousels
• Remove unused creation of existingCssClasses file
• Catch potential chromedriver not responding test sequences
• Add WdDriver stopProcessTree logic to kill Chrome SUT if chromedriver hangs
• Fix potential null pointer exception in WdRootElement scroll
• Refactor executeCanvasScript logic to Canvas web classes

Misc updates

• Catch potential IllegalStateExceptions opening the system clipboard