Increase width of the add/del bar

[wilzbach]

For big PRs, it's typically quite hard to see which files have the biggest changes. Also the nice bar is hardly visible in general.
This has been bothering me for a while now and I finally got around looking into it.
Preview:

What do you think? Even bigger?

[CyberShadow]

I was planning on making it generate a tree instead of printing the full path for every file... that should fix display even for very nested hierarchies, like those generated by DDox.

[wilzbach]

Yeah that would be really nice :)
BTW a simple improvement would also be to sort the files by their diff size as this solves the use case where a small modification creates a one-line change in almost all files and the reviewer is only interested in the main file and and one or two of the changed files, but the files with the biggest diff changes should have priority.