Feather diff viewer

[thdaele]

Other than the UI it should be finished, if someone wants to help make the UI better, feel free to reach out here or on discord since I am not the greatest at UI

[worldwidepixel]

Seems perfectly fine? I'd recommend two things out of nitpickyness:

1. Make the diff inside a div with a max height and scrollbar, so the page doesn't become a kilometre long.
2. Modify the site CSS to make scrollbar colours match the selected colour scheme of the site.

[thdaele]

What I personally don't like about it atm is that when there is a lot in the diff. It is hard to see where the list of the classes, methods and fields start. I tried to place them next to each other (and adding individual scrollbar would probs be nice too then) but I ran into my limited knowledge of CSS
Should be addressed in the latest commit