event.c: Simplify timer use in event_poll()

event_poll() always leaves the libuv I/O loop after one iteration. The
duration for how long the loop polls for I/O is given by the shortest
timeout of all active timers. Is no timer active, I/O is/could be polled
indefinitely.

To make sure our timer is still active when I/O polling begins,
a prepare handle is used to start the timer right before the polling.

But by only using a timer that restarts after its timeout was reached,
we also can assure that polling is done with (nearly) the same finite
timeout.

For a short explanation how the I/O loop is working, see
http://docs.libuv.org/en/latest/design.html#the-i-o-loop.

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