Full Dining rewrite (#250)

* Made some progress in dining api rewrite

* Greatly simplified DiningVenue parsing logic by depending completely on custom Codable implementations

* Improved handling of .meals property of DiningVenue; it is now a date to meals dict

* Implemented hour formatting functions

* Reintegrated pods. Beginning work on DiningViewModel

* Created DiningDataStore, beginning to replace cache/api logic.

* Created new networking functions, hooked them up to DiningAPI

* Reimplemented dining settings, removed most menu code

* Finished base implementation of dynamic dining screen

* Initial implementation of lightweight cacheing layer

* Completed cacheing implementation. Fixed dining settings. Finished dynamic loading of Dining.

* Removed many old files.

* Removed venue assets (3mb), completed Fall 2019 dining rewrite pending feedback

* Moved the cache to its own file

* Fixes based on josh comments

* fixed venue category names

* Coding Key change for image url

* removed print

* Added images and fixed on-first-load behavior

* Filtering Houston market

* Added closed today label

* Added date diffing so venues say when they are next open

* Fixed merge conflicts

* Made dining status labels lowercase

* Fixed dining cell color

* Changed date display string, now displays next open time if distance over 1 hour

* Changed dining status format

Author: DominicHolmes