Feature: output diff as a csv

[boxydog]

I like csv (actually usually tsv) files because they are easy to process with command-line tools.

If this diff tool outputted the diffs as a csv, then I could easily use command line tools on the diff.

It wouldn't have to have the same number of lines or format as the original. It could even be in normalized form, such as:

key1 field1-name field1-value field2-value
key1 field2-name field1-value field2-value
...