This allows all the account state information to live in gui
while the sync-relevant data stays in libsync.
I also moved quotainfo to gui since it depends on the account state.
I just wanted to fix the warning:
QObject::connect: No such slot OCC::SettingsDialog::slotUpdateAccountIcon(QIcon) in settingsdialog.cpp:108
It turns out we don't need anymore the signal or any of the code that
was updating the account icon in the settings dialog since it we now have a fixed icon