Update code style according to latest updates in the API.
Fix a couple of PHPCS warnings.

Add chaining for methods: setStyle, setSource, addObject, addLayer, addControl, addComponent, addInteraction.
Syntax cleanup, PHPCS fix, move comments from object to interface.
Update to Openlayers 3.12.0

Add PreRender callback
Add Quicktabs integration module
Add Boxes integration module
Move Content Types Ctools plugins in its own submodule.
Make use of '#empty_option'.
Code cleanup.
Fix namespaces.
Replace openlayers_object_load with Openlayers::load and some other functions too.
Update services.yml file.
Add Plugin and library information in settings page.
Removed getLayers(), getSources(), getControls(), getInteractions(), getComponents in favor of
getObjects($type).
Remove Projections tab as support is not ready.
Edit layer style directly from the map edit form.
Add Openlayers::load() and Openlayers::save() to replace CTools crud functions.

- Complete rewrite of the module.
- OpenLayers 3 JS Library
- New user interface, options...
- Many things are broken and needs to be worked on, but at least, we have something to start.

Provide a drush command 'dl-openlayers' to download the OpenLayers library.