Feature Request: Add diff.word-diff <mode> and perhaps diff.word-diff-regex <regex> configuration options to enable always using word-diffs in git diff

[Doron Behar <doron.behar@xxxxxxxxx>]

I've just came across the wonderful command line option for `git diff`:
`--word-diff`. It could be great to have a configuration option that
will enable this feature by default when running `git diff`.

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