Add the ability to send input directly to windows

[dkrutsko]

It would be convenient to be able to send keyboard and mouse inputs directly to windows themselves. However, there is no rock solid way of doing this across all applications. Still, it might be worth looking into.

[FunkMonkey]

For Windows, you can have a look at the source of Autohotkey_L, especially at SendKeys in keyboard_mouse.cpp. It's all extensively documented. Autohotkey is probably a great source of inspiration, anyway.

[dkrutsko]

Hey, thanks for the link, this looks great. I also need to figure out how to do this on Linux and Mac, but I suspect it won't be too difficult.