Throw specific exception if element is not clickable

The exception introduced with #1202 that is thrown when an element is not clickable unfortunately is a WebDriverException. It would be great if it could be a subtype of WebDriverException (or e.g. even a subtype of InvalidElementStateException.
In cases where you want to handle those errors you don't want to catch all WebDriverExceptions.

[oceanchow]

good point, i agree

[shs96c]

Closed in bd9d415

[barancev]

Note that ElementNotInteractableException is a subclass of InvalidElementStateException