Nice and clean

Improvements for Windows users:

• The library used to package our binaries changed the format of the created
  Uninstall Windows registry subkey without cleaning up old keys when updating
  the application. This means that Windows users updating from a version prior
  to v3.16.0 to v3.16.0 will have 2 Cozy Drive applications listed in the
  Windows programs manager and uninstalling the old version will actually
  uninstall the most recent and leave them with a seemingly un-uninstallable
  Cozy Drive version.
  We added some cleanup logic to Cozy Drive to take care of removing the old
  registry subkey automatically.