Made time waited for raw keyboard input to be processed configurable.
Made property virtual
Another wait for system input queue processing on keyboard input (before wait was applied only for strings, not for special keys, which is incorrect)
Rename TextBoxRawInputProcessingTime -> RawInputQueueProcessingTime because it is not specific for TextBox, but for all user actions that are sent via SendInput method
Added waiting for raw input queue processing for mouse clicks as well
This test fails often (text is not typed till the end on some iteration)
Merge pull request #237 from ivan-danilov/master

Made time waited for raw keyboard input to be processed configurable.