Everything works like Node.js. loop() will not need be called explicitly any more.
Including some changes:
* Every thread of script has a looper.
* Use a servant thread in gestures functions of GlobalActionAutomator and image available listener of ScreenCapture.
* For keeping events key and touch listener alive, add Loopers.waitWhenIdle to control whether or not Looper should quit when it has nothing to do
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