[Feature] BetterFormattingRedux support new MardDown syntax

**Which plugin/theme is this about?**
BetterFormattingRedux

**Is your feature request related to a problem? Please describe.**
Suggestion

**Describe the feature you'd like**
Now that discord supports expanded MD formats would be nice to see more options in the menu
https://gist.github.com/matthewzring/9f7bbfd102003963f9be7dbcf7d40e51
Headers, mask links, etc...


