Introducing bot.dom.isInParentOverflow atom
Simplifying element scroll calculation code by using the new isInParentOverflow atom.

Fixes issue #2387.
Updating .NET IE test for scroll overflow
Block ability to set FileDetector for browser-specific drivers in .NET.

Most of the server-components (chromedriver.exe, IEDriverServer.exe,
WebDriver Firefox extension) do not understand how to handle the
FileDetector property. They simply approach all file upload as uploading
from the local machine. If you need to upload remotely, use an instance of
the RemoteWebDriver class.