Fix the monstrosities that are the data structs.

[juliusiv]

Maybe they should just be modules that wrap maps instead of structs.

[juliusiv]

Psyche, they should probably stay structs for reasons mentioned in this article https://engineering.appcues.com/2016/02/02/too-many-dicts.html specifically:

• Use string-keyed maps for data which has just arrived from an external source.
  • Convert external data to structs as soon as possible.
  • Use ExConstructor or something similar to abstract away the handling of string-keyed maps.
• Use structs almost everywhere else in your program.
• Use other atom-keyed maps sparingly.
• Use keyword lists only to provide arguments to a function.

With this in mind, probably should make a struct that data coming from the client can be put into. Then use ExConstructor to create that struct and get the atoms out of that and give them to the Browser and Weather structs and then they don't need crazy case statements.