Push a stack frame when Game::createmenu() is called

Unless it's the main menu, or unless it's not the same menu. Whether or
not the menu is the same is left up to the caller, because some menus
could be the same but use different names, so we can't simply
automatically check that the names are different and assume that they
aren't the same menu.

desktop_version/src/Game.cpp

@@ -6552,8 +6552,23 @@ std::string Game::timetstring( int t )
     return tempstring;
 }
 
-void Game::createmenu( enum Menu::MenuName t )
+void Game::createmenu( enum Menu::MenuName t, bool samemenu/*= false*/ )
 {
+    if (t == Menu::mainmenu)
+    {
+        //Either we've just booted up the game or returned from gamemode
+        //Whichever it is, we shouldn't have a stack,
+        //and most likely don't have a current stackframe
+        menustack.clear();
+    }
+    else if (!samemenu)
+    {
+        MenuStackFrame frame;
+        frame.option = currentmenuoption;
+        frame.name = currentmenuname;
+        menustack.push_back(frame);
+    }
+
     currentmenuoption = 0;
     currentmenuname = t;
     menuxoff = 0;

desktop_version/src/Game.h

@@ -115,7 +115,7 @@ public:
 
     std::string timetstring(int t);
 
-    void  createmenu(enum Menu::MenuName t);
+    void  createmenu(enum Menu::MenuName t, bool samemenu = false);
 
     void lifesequence();