Include markdown styling on copy

[DrafaKiller]

Problem

Sometimes I use this extension to edit the markdown styling of content from other places, like how I'm doing with this issue. Pasting the content into this editor works fine, but copying it out loses all markdown styling.

Solution

Have a more robust copy-paste system that also works outside the editor, including the markdown syntax when copying the content that we have selected.

Would also solve other bugs that exist in the current implementation, like #182.

Alternatives

When I want to copy the content outside the editor, I have to switch to the default editor mode and copy it that way.

example.mp4