Partially revert "Make AssemblyInfo.cs usage consistent through solution"

For some reason, changing the AssemblyInfo files broke the installer. The
installer would "forget" to reinstall the Windows service during an upgrade.
After a repair everything would work fine again.

I've no idea why this happens.

This partially reverts commit e6ef6f8f9500b9331d27d1e24472e7a20c07eb4e.