Refactor Types

[braxtonhall]

∟-- src/
  ∟-- entities/
    |-- Music.ts
    | |-- Song
    | ∟-- Playlist
    ∟-- Settings.ts
      |-- Config
      ∟-- isConfig(..)

It's chaotic how much is in Types.ts and also how the Type checks are in Util. Get em into another directory. Entities from NeDBAdapter can move too.