Handle marker cluster

As a visitor, I should know when a lot is happening at the same time, and should be able to navigate a specific location (latitude/longitude).

Use case:

• the city of Lausanne uses meetings to represent opening time of an office.
  • from 12:00 to 18:00 everyday.
  • The geographical location is always the same marker. As a user I should be able to click on the point, and overview the different hours for the office.

Now, the state of the module display all card list in the drawer, and paint hundreds of marker one over the other. That's fine because it wasn't a feature until now ;)