Fix the Windwos installer

Install the Documentation and include it in the installer.
Try and get all the directories and files removed in the uninstaller.
Where the heck does 'oldshare' come from?

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Set the menuRole property on certain menu entry QActions

Telling Qt that the "Preferences" menu entry is
QAction::PreferencesRole will make it be moved to the System menu on
Mac, for example.

Fixes #327

Signed-off-by: Thiago Macieira <thiago@macieira.org>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>