* add EventListeners in the render() method instead of the constructor
* scrollable widget: add EventListeners in render() method instead of constructor +
... move logic from constructor to render()
* linkcatcher: add EventListeners in render() instead of constructor
* fieldmangler: add EventListeners in render() instead of constructor
* edit-bitmap: initialise editorOperations in render() instead of constructor
* list-widget: initialise storyviews in render() instead of constructor
* vars widget: execute Widget.call(this) in render() instead of constructor
... not shure what this should do
* Update fieldmangler.js
* Update edit-bitmap.js
* Update linkcatcher.js
* Update navigator.js
* Update scrollable.js
* Update list.js
* Update vars.js
We need to send messages to the parent so that we don’t set up an
infinite loop by sending `tw-navigate` messages. Also we need to pass
along the target of the navigation.
Getting rid of the old widget mechanism files finally gives us a payoff
for all the refactoring. Still a bit of tidying up to do, and we need
to re-introduce the animation mechanisms.
Get rid of the separate renderContext stack and instead have a parent
pointer on renderer nodes. This lets us walk back up the render tree to
resolve context references
