Anchor links to specific line(s) in commit diffs

Would be useful to have anchors for lines in commits diffs (*in addition to already existing anchors in browsing "regular" files*), for example like it is done on GitHub:

```
https://github.com/antonmedv/gitmal/commit/2d31323ad174fb2f7aa7312009814118784a45b8#diff-2873f79a86c0d8b3335cd7731b0ecf7dd4301eb19a82ef7a1cba7589b5252261R78
```

So here the `#diff-2873f79a86c0d8b3335cd7731b0ecf7dd4301eb19a82ef7a1cba7589b5252261R78` part is an anchor to a specific line in the diff.

Or like this for a range of lines:

```
https://github.com/antonmedv/gitmal/commit/2d31323ad174fb2f7aa7312009814118784a45b8#diff-2873f79a86c0d8b3335cd7731b0ecf7dd4301eb19a82ef7a1cba7589b5252261R78-R80
```

so it's the same but plus `-R80` part.