Add inline summaries in `--write-changes` mode

[Jacobfaib]

In regular mode codespell shows what changed:

foo.h:63: Creats ==> Creates

but with -w you only see

FIXED: foo.h

It would be nice if we could also see inline what changes were made:

FIXED: foo.h Creats==>Creates

There is the --summary option, but that doesn't play nice when codespell is run in parallel (such as through pre-commmit), because multiple summaries are printed:

FIXED: foo.h
FIXED: bar.h

-------8<-------
SUMMARY:
creats        1

...
FIXED: baz.h

-------8<-------
SUMMARY:
aswdasd        1

(note that the summaries are also jumbled as processes finish, not all at the bottom)