Pref: Wb: remove args first element on restart.

- isRebootRequired is not public but in accept&reject.
- PreferencePage::isRebootRequired changed to const
- Change 2 warnings to log
- remove useless  c_str()
- Change DlgPreferencesImp::isRebootRequired name + reboot by restart everywhere.
- Sort workbenches so that disabled wb are sorted.

src/Gui/CommandStd.cpp

@@ -385,7 +385,6 @@ void StdCmdDlgPreferences::activated(int iMsg)
     if (cDlg.exec()) {
         cDlg.activeGroupPage(groupName, index);
     }
-    cDlg.isRebootRequired(); //The user may have applied first, then clicked the cancel button so it's not in the if(cDlg.exec())
 }
 
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