Feature: For "No changes or only EOL changes" in diff viewer, tell us more concrete details

[sken130]

1. Whether there is really no change at all, or there are EOL changes
2. If there are EOL changes, then show the count of LF, CRLF, CR before and after the changes.

[love-linger]

git diff --ignore-cr-at-eol outputs nothing if file only contains eol change just like it has no change

[sken130]

Can actively use git show to obtain the original committed version?