Send out a LuaMsg to Chobby when creating a new save (#3972)

Add a new LuaMenuMsg called "gameSaved" that will trigger an automatic refresh of the Saved Games menu in lobby.

luaui/Widgets/gui_savegame.lua

@@ -209,6 +209,10 @@ function widget:TextCommand(msg)
 		Spring.Echo("Trying to save:", msg)
 		local savefilename = string.sub(msg, 10)
 		SaveGame(savefilename, savefilename, true)
+
+		if Spring.GetMenuName and string.find(string.lower(Spring.GetMenuName()), 'chobby') ~= nil then
+			Spring.SendLuaMenuMsg("gameSaved")
+		end
 	end
 end