[change] Algorithm determining map marker colors when location contain multiple devices must be improved

[nemesifier]

Right now the algorithm is too simplistic to be really useful but I do not have a precise idea right now of what we can do to get a better result so I am opening this issue as a placeholder for later investigation.

[ghost]

Where is the current algorithm? Do you want to do something like augment the color based on the number of devices within some polygon on the map? Would you be bucketing them so that for example, 5 devices look like 1 until you zoom in enough?