Migrate map data transfer from AJAX to Channels

[dylanm312]

Is your feature request related to a problem? Please describe.
The map data is currently fetched by each client in the form of individual HTTP Get requests several times per second. This clutters up the network request log in the browser and also is not a very clean way of implementing constantly changing data.

Describe the solution you'd like
Sending the data via persistent websockets using Channels would be a cleaner way to get the map data from the server to the client. It would also allow for continuously updating maps, rather than maps that update every x milliseconds (based on the setInterval() parameters for the AJAX request.)

Describe alternatives you've considered
The alternative would be the current solution, which involves each client polling the server every x milliseconds for new map data.