[xmonad] New virtual X mouse tool

[Blake Miller]

This is only indirectly related to XMonad...

For a while I've been using keynav to avoid reaching for the mouse for
those few annoying circumstances which seemingly require a mouse.

I did find that keynav sometimes saved me some energy, but I only found it
useful for simple clicks. It does not seem useful if you want to click and
drag a region, for example.

Repeatedly bisecting the screen to narrow in on a point for the cursor is a
fine approach and has some advantages, but I found myself wanting something
more visceral: a little physics simulation to let me move the mouse around
using the keyboard, like a video game.

So I put this little utility together, in C++, and I have a keybinding
spawn it from xmonad.

It was an interesting challenge to make it single-threaded and still
simultaneously run the physics loop, poll for X events, and send fake mouse
events with XTest. I ended up designing it around channels (as in CSP)
using boost::fiber.

I hope someone finds it useful or entertaining! I had fun writing it.

https://github.com/blak3mill3r/mouser
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