changed category id map keys and added transactions to locator

trackeroo/lib/frontend/utils/transaction_listtile.dart

trackeroo/lib/frontend/views/category_view.dart

trackeroo/lib/frontend/views/home_view.dart

trackeroo/lib/logic/models/category.dart

trackeroo/lib/logic/models/category.g.dart

trackeroo/lib/logic/models/transaction.dart

trackeroo/lib/logic/models/transaction.g.dart

trackeroo/lib/logic/services/categories_controller.dart

trackeroo/lib/logic/services/locator.dart

trackeroo/lib/logic/services/transactions_controller.dart