Define datastructure for the map

The project needs a well defined datastructure to work with generating the heat map and finding the most optimal path.

Requirements:

• The datastructure has to have a way of mapping the point to a geographical location
• It need to have a way of storing the total distance (heat map intensity)
• Needs to have a way of accessing all data without repetition (maybe to list)
• Needs to have connections between nodes (and their travel time)
• Should provide a well documented api for adding stops/connections

Focus: For the first prototype this should be generated based on just the ztm stop data. This should read all the stops and connections to create a graph. Time of departure for connections should be irrelevant for now but should at least use average travel time.