Store the avatar voxel URL along with the rest of the avatar settings.
OK, we don't need this sync.  Clearly the problem I was seeing on OS X lies
elsewhere.
Use the default QSettings constructor and let it get the application info
from the QCoreApplication properties.
We need to set these before initMenu, as that's where we create the QSettings.
OK, I found the problem: duplication of state for the "autosave" option.
Let's just use the QAction, as does everything else.
Merge branch 'master' of https://github.com/worklist/hifi into gyroquat
Merge branch 'master' of https://github.com/worklist/hifi into gyroquat
Fix for initial camera transition.
Merge pull request #512 from ey6es/gyroquat

Fixes for preferences: store avatar voxel URL along with other avatar settings, use QAction rather than separate boolean for autosave.