listen to map for changes in temporal extent

[ischneider]

And update or warn user as needed.

User actions that trigger:

• annotations modified done
• layer added or removed done
• layer modified

Updates:

• story boxes
• timeline/slider done

I had mentioned we might want to warn the user if the temporal extent of the change is outside the current extent indicated by the story boxes but it seems like we could take automatic action:

• if single story box, simply extend to contain the change done
• when more than one story box is present
  • if layer extent is before current min extent, extend first story box extent
  • if layer extent is after current max extent, extend last story box extent
  • otherwise, add layer to all intersecting story boxes

If this behavior is not acceptable, we could later add an option to disable (and warn the user)

[bartvde]

@ischneider wondering how we will catch layer modified? Since editing would be done in a separate MapLoom instance?

[ischneider]

True layer modified is probably the lowest priority at the moment, especially if we don't integrate with editing in MapLoom.

[ischneider]

Partially addressed w/ 0ad37ef - covers cases of annotations modified and layer add/remove with timeline/slider update and single storybox update.