Update product manufacturer to be "The Mumble team"
Make the Windows install create desktop shortcuts again.

Created sub-features for desktop shortcuts. Will require
new translations.

Fixes #1282
Add "Uninstall" shortcut to start menu folder with windows installer.

Instead of directly triggering uninstall (/x) this calls install (/i)
which will allow the user to modify, repair or actually uninstall the
application.