added BaseController that stores FXML files for all views, started bugfixing for equals methods, started working on recipe view fxml file

added more validation to Recipe constructor, fixing bugs in RecipeSearch, tests for RecipeSearch. now adding full recipes to the shopping list

testing shopping list, modified RecipeComponent interface: added a new method getMeasurement(). fixed logging

implemented algorithm to calculate nutrition tables for recipes from their ingredients -> added tests.
implemented equals() method for NutritionTable -> added tests.

slight refactoring...

boilerplate