Implement code signing on Windows

Set version number for release 0.8.3

Set version number for release 0.8.2

Set version number for release 0.8.1

Set version number for release 0.8.0

Set version number for release 0.7.9

Set version number for release 0.7.8

Set version number for release 0.7.7

Add change forgotten in previous commit

Set version number for release 0.7.5