feat: add MardownItFancyLists plugin

[k1rowashere]

Adds markdown-it-fancy-lists markdown-it plugin, which adds support for Pandoc-like list syntax.

(alpha, roman... ordered lists)

Think it is pretty useful.

ps.
I would be open to implement a general and configurable plugin loader for markdown-it, that could be a better solution?

[fmorroni]

Hi, I just tried this changes but it doesn't seem to be working. I still only get roman numeral ordered lists. Do I need to change something else besides the two lines added by this pr?

[k1rowashere]

Hi, I just tried this changes but it doesn't seem to be working. I still only get roman numeral ordered lists. Do I need to change something else besides the two lines added by this pr?

That is odd, it works on my machine™ and I am using this exact branch. (I haven't installed anything)
Can you provide the markdown file you are using?
Perhaps the plugin needs some configuration?

Example of it working:

[fmorroni]

Hi sorry I kinda forgot about this. I just checked with your exact branch and it is indeed working. I then checked back with my own (with your changes added) and it also seems to be working... I don't really know why I thought it wasn't working before haha