So far, the scripting API was using events to communicate between WA and the iFrame.
But often, the scripting API might actually want to "ask" WA a question and wait for an answer.
We dealt with this by using 2 unrelated events (in a mostly painful way).
This commit adds a "queryWorkadventure" utility function in the iFrame API that allows us
to send a query, and to wait for an answer. The query and answer events have a unique ID to be
sure the answer matches the correct query.
On the WA side, a new `IframeListener.registerAnswerer` method can be used to register a possible answer.
The generation was broken due to the refactoring in several classes (some of them where not properly exported).
Also, trying to generate the NPM package on every build now (to detect issues).
Simplifying a lot what was done (even if the new code is a bit less automated, it allows to list exactly the methods we want to see deprecated and to add a notification message)
