Feature/media embeds

[worleydl]

Adds support for embedding media denoted by media: in the fieldSpec. Relies on o19s/splainer-search#78 to function.

Description

Added a new media section to the field listing that will embed any supported audio/image/video URLS.

Motivation and Context

Fixes Issue #56

How Has This Been Tested?

Tests have been added to the splainer code, the rendering was tested manually for an audio/image/video embed.

Screenshots or GIFs (if appropriate):

Types of changes

• [] Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• [] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• [] I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.