Add highlighting on file names

[Anicky]

To increase readability, it could be interesting to colorize file names. Some patch files edit multiple files.

Here's a sample of patch concerning more than one file : https://www.drupal.org/files/issues/2018-05-04/media-2967590-php-mbstring-extension-check-2.patch

[Keenegan]

Currently working on it, I added a basic highlighting with #2
Still thinking about how it shoukd look, I have 3 ideas for now

I'm open for new ideas :)