Move all of the normal onionshare logic into Tab, and make a new placeholder GUI for the main window

onionshare_gui/gui_common.py

@@ -18,6 +18,7 @@ You should have received a copy of the GNU General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>.
 """
 from onionshare import strings
+from onionshare.onion import Onion
 
 
 class GuiCommon:
@@ -44,6 +45,9 @@ class GuiCommon:
         # Load strings
         strings.load_strings(self.common)
 
+        # Start the Onion
+        self.onion = Onion(common)
+
         self.css = {
             # OnionShareGui styles
             "mode_switcher_selected_style": """