Storage: Sort Ingredients

[PaulHo0501]

User Story

US 01.06.01

Description

As a user I want to sort my ingredients based on description, category, best before date and location. Please implement these functions right in the Storage Fragment

Technical Requirement

1. Use Firebase as the sorting agent
2. Use Popup Menu as display agent

Acceptance Criteria

1. Functionally working code
2. Synchronize with the database