Add a setting to avoid showing video thumbnails

Description

A setting has been added to avoid showing the video thumbnails in lists

Motivation and Context

Thumbnails can be spoilers / privacy issues

How Has This Been Tested?

Emulator API 28

Screenshots / GIFs (if appropriate)

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Enhancement (non-breaking change which cleans up / improves existing functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• I have read the CONTRIBUTING section of the README document.

Resolves

Fixes: #852 (closed)