Project code support (#336)

* Determine if project codes are supported

* Add helpers for boolean functions

* Adds helper methods for generic "model" class

- Will allow us to do some good refactoring

* Refactor the refactor

* Add debug support and getMap function

* Major refactoring for model data accessors

* Handle null values

* Add sentry reporting if key is used incorrectly

* Fix typo

* Refactor createFromJson function

* Add model for ProjectCode

* Display and edit project code for purchase orders

lib/l10n/app_en.arb

@@ -759,6 +759,9 @@
   "profileTapToCreate": "Tap to create or select a profile",
   "@profileTapToCreate": {},
 
+  "projectCode": "Project Code",
+  "@projectCode": {},
+
   "purchaseOrder": "Purchase Order",
   "@purchaseOrder": {},