parser: Add missing extended header lines

parser: Add missing extended header lines

Patchwork didn't recognise some patches due missing some extended header
lines (e.g. "old mode" and "new mode" for renaming file mode, see [1]).
Thus adding all modes from git doc [2].

[1] https://lists.ozlabs.org/pipermail/patchwork/2019-April/005741.html
[2] https://git-scm.com/docs/git-diff#_generating_patches_with_p

Suggested-by: Veronika Kabatova <vkabatov@redhat.com>
Signed-off-by: Petr Vorel <petr.vorel@gmail.com>
Closes: #267
(cherry picked from commit 753e4572d7e8b836daf6087820c49637b3b23602)