Extract agent/EV coordinates from the data for placement over SLD and map SVGs

[tsmbland]

We want to take agent/EV location data in the Opal and/or DSR dataframes and convert this to x/y coordinates for placement over the map and SLD SVGs

See #35 (comment)

There are four functions that need to be modified (they are just making up random data for now):

get_agent_sld_coordinates
get_ev_sld_coordinates
get_agent_map_coordinates
get_ev_map_coordinates

More details about what these functions should be doing can be found in their docstrings

[AdrianDAlessandro]

@tsmbland Can you just double check the description in this issue is up to date?

[dalonsoa]

Hi @pclemow , this issue is assigned to you, in principle. Are you planning to work on it before Christmas? Not in a rush, just to make some plans about what will be ready and what will not before we all go on leave.

[pclemow]

No, I dont expect I will have time to get that working before Christmas.