* Implement GH-830: Add coming soon tooltips

This implements coming soon tooltips for:
* the small stage size
* save, load and language

It also creates the component that can be copied over into the paint editor for use there as well.

Lastly, this does a small refactor on the full screen implementation to include multiple small screen sizes too.

  1. Fixed issue with sprites not being dragable when stage zoomed.

  2. Fixed issue with coordinates of mouse position being wrong when
     stage is zoomed. This was caused by the renderer not being
     resized when zooming/unzooming.

  3. Refactored zoom control to separate react component/containter
     with global reducer for isZoomed, which is passed to the stage
     container. This allows for the zoom control to zoom the stage
     menu and stage as seperate containers.

  4. Added icons zoom/unzoom for stage zoom control. Moved icon
     position to be part of stage menu floating to right of start/stop
     buttons.

Using react-intl-redux package.

This just sets up the default English. Language switching in another PR. Requires locale/messages.json to exist, `{}` is ok.

Otherwise it's very annoying to get access to the storage engine to load asset data.

In preparation to split the sprites from the stage, start managing the target list state in a single place.