mshtml-sessionStorage: Remove message from README.md because the patch is currently disabled.
patchupdate.py: Use author information from patch files instead of definition file.
patchupdate.py: Change output format of 'wine --patches' to match the wine ANNOUNCE file.
patchupdate.py: Extract revision information directly from patch subject.
Make definition files optional, move revision numbers to corresponding .patch files.
Update debian/changelog with recent changes.