move events out of webkitgtk ?

[kapouer]

All events could be managed with code outside this module.

[kapouer]

Especially the "idle" event tracker, which could be useful in other projects like jsdom.

[kapouer]

With latest 54b264d and 81d3800 all the logic for idle event might be done entirely using a client script.

Filtering requests being part of that logic, both functionnalities should go together in a separate module which could in turn be used with jsdom or webkitgtk.