lat/long benvo structure

[apeterson91]

New Class

Create a new class which will inherit from Benvo() in order to accomodate built environment data structures where coordinates are available.

Class Methods

• Should include methods that allow for calculation of (different kinds of) distances between subject lat/long coordinates and BEF lat/long coordinates - thus creating a Benvo as well as different plotting methods via e.g. ggmap.
• May/may not allow for easy coordination with sf objects... will explore in development