Categories, recipes and ingredients now saved in hashmap together with their associated code and a whole bunch of refactoring to go along with it. TypeAdapters for Recipes, NutritionTables and Categories. Saving and retrieving Recipe, NutritionTable and Category to / from JSON works (see tests).

simplified NutritionTable equals() method. created component classes for RecipeTile and CategoryCheckBox

started moving dependencies to TastyPages class. Colour codes for categories are now saved in a string. recipe search by category works now, including UI updates

introducing components: a way to reuse elements in different scenes. modified the Main view to fetch recipes and add them to the UI