Add being able to press Esc to return to previous menu

This is a small quality-of-life thing that makes it so you don't have to
move your menu selection all the way over to the "return" button in
order to return to the previous menu. You can just press Escape instead
to return to the previous menu. The previous behavior of pressing Escape
was to bring up the 'confirm quit' menu, or if you were in an options
menu in-game, return to the pause menu.

If you're on the main menu (and thus don't have any previous menu) and
press Escape, the game will instead bring up the 'confirm quit' menu.
For consistency, the "quit game" option on the main menu will also bring
up the 'confirm quit' menu as well, instead of immediately closing the
game.

Pressing the controller button mapped to Escape will also work as well.

The only menus that don't have return buttons are the 'countdown' menus
- so the game will not let you press Escape if there's a menu countdown
happening.

Now that pressing Escape in the 'continue' menu will just bring you back
to the 'play' menu, there's no need to specifically put
map.nexttowercolour() first when canceling the 'confirm quit' menu.

desktop_version/src/Input.cpp

@@ -261,10 +261,9 @@ static void menuactionpress(void)
  #define MPOFFSET -2
 #endif
         case OFFSET+5:
-            //bye!
+            music.playef(11);
-            music.playef(2);
+            game.createmenu(Menu::youwannaquit);
-            game.mainmenu = 100;
+            map.nexttowercolour();
-            graphics.fademode = 2;
             break;
 #undef OFFSET
 #undef NOCUSTOMSOFFSET
@@ -477,8 +476,8 @@ static void menuactionpress(void)
             break;
         default:
             music.playef(11);
-            map.nexttowercolour(); //This goes first, otherwise mismatching continuemenu color is possible
             game.returnmenu();
+            map.nexttowercolour();
         }
         break;
     case Menu::setinvincibility:
@@ -1610,28 +1609,40 @@ void titleinput(void)
     if (key.isDown(KEYBOARD_ENTER)) game.press_map = true;
 
     //In the menu system, all keypresses are single taps rather than holds. Therefore this test has to be done for all presses
-    if (!game.press_action && !game.press_left && !game.press_right) game.jumpheld = false;
+    if (!game.press_action && !game.press_left && !game.press_right && !key.isDown(27) && !key.isDown(game.controllerButton_esc)) game.jumpheld = false;
     if (!game.press_map) game.mapheld = false;
 
     if (!game.jumpheld && graphics.fademode==0)
     {
-        if (game.press_action || game.press_left || game.press_right || game.press_map)
+        if (game.press_action || game.press_left || game.press_right || game.press_map || key.isDown(27) || key.isDown(game.controllerButton_esc))
         {
             game.jumpheld = true;
         }
 
-        if (key.isDown(27) && game.currentmenuname != Menu::youwannaquit && game.menustart)
+        if (game.menustart
+        && game.menucountdown <= 0
+        && (key.isDown(27) || key.isDown(game.controllerButton_esc)))
         {
             music.playef(11);
-            if (game.ingame_titlemode)
+            if (game.currentmenuname == Menu::mainmenu)
             {
-                game.returntopausemenu();
+                game.createmenu(Menu::youwannaquit);
             }
             else
             {
-                game.createmenu(Menu::youwannaquit);
+                if (game.ingame_titlemode
-                map.nexttowercolour();
+                && (game.currentmenuname == Menu::options
+                || game.currentmenuname == Menu::graphicoptions))
+                {
+                    game.returntopausemenu();
+                }
+                else
+                {
+                    game.returnmenu();
+                }
             }
+
+            map.nexttowercolour();
         }
 
         if(game.menustart)

desktop_version/src/editor.cpp

@@ -3928,7 +3928,30 @@ void editorinput(void)
         else
         {
 
-            ed.settingsmod=!ed.settingsmod;
+            music.playef(11);
+            if (ed.settingsmod)
+            {
+                if (ed.scripteditmod)
+                {
+                    ed.scripteditmod = false;
+                }
+                else if (ed.settingsmod)
+                {
+                    if (game.currentmenuname == Menu::ed_settings)
+                    {
+                        ed.settingsmod = false;
+                    }
+                    else
+                    {
+                        game.returnmenu();
+                        map.nexttowercolour();
+                    }
+                }
+            }
+            else
+            {
+                ed.settingsmod = true;
+            }
             graphics.backgrounddrawn=false;
 
             if (ed.settingsmod)
@@ -4037,12 +4060,6 @@ void editorinput(void)
                     key.keybuffer=ed.sb[ed.pagey+ed.sby];
                     ed.sbx = utf8::unchecked::distance(ed.sb[ed.pagey+ed.sby].begin(), ed.sb[ed.pagey+ed.sby].end());
                 }
-
-                if (key.isDown(27))
-                {
-                    ed.scripteditmod=false;
-                    ed.settingsmod=false;
-                }
             }
         }
         else if(ed.scripthelppage==1)