Support filtering in web app

[maar35]

Introduction

In the context of moving all C# Rating view functionality to Django, this user story handles filters.

Requirements

• [x] Use Django
• [x] Filter on films with duration less than a specified threshold
• [x] Use same threshold as in the C# version
• [x] For each fan, filter on rated
• [x] Create a common tool to filter
• [x] Filter on subsection
• [x] Add tests
• [x] Update documentation