[FEATURE] Allow BBCodes & Markdown Codes

[ghost]

Problem
When i upload images using an image hosting website. It gives me embed codes called BBCode & Markdown codes
Currently one 1 or two BB Codes or Markdown codes work on Amethyst. Usually only the direct link.

Solution
Configure Amethyst to allow all the BBCode & Markdown codes

Additional context
Here is a picture of the bbcodes & markdown codes we receive when we upload pictures
BBcodes & markdown codes are great linking multiple images in an album type setting.
It also allows us to host our own images if we run our own image hosting website.