Implement displaying of answer fields, title, and sources #3256
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What does this PR do?
This PR implements the ability for plugins to display additional information in answers: fields, title, and sources.
Visual Example:

Plugin Code for Example: https://gist.github.com/secondtruth/ed32c9d3cb898513dc2c6ecaea57bb25
Why is this change important?
This change allows plugins to display additional information and structured data in a beautiful way, without letting them inject arbitrary HTML into the frontend.
How to test this PR locally?
as usual
Author's checklist
nothing
Related issues
none