Polling behavior kills kittens

[bgamari]

Recently I noticed that each of the dozen-or-so emacs processes running on my laptop were waking up 10 times a second, severely impacting my laptop's battery life. helm-timers revealed that the culprit is guide-key/polling-function. Surely there is a better way to accomplish the goal of this timer than polling at 10 Hz.

[wasamasa]

Note that even if this is fixed, popwin will leave spurious timers around with a similiarly bad interval.