Extension:GuidedTour/Moving between tours discussion 2014-06-05

The goal is to have a way of specifying a step in a builder, anywhere it can be currently specified (next, back, transition), even when it's in another tour. At some point, we can also change existing internal IDs (e.g. tourId and tourInfo) to use this.

We went with a gt.StepID value object for this, with a constructor passing in  and  :

Notes from meeting

 * Specify a step in another tour anywhere you can specify a step in the current tour (next, back, transition).
 * Lazy loading
 * We use tourId in some public APIs, e.g. https://doc.wikimedia.org/GuidedTour/master/#!/api/mw.guidedTour.launcher-method-launchTour