Add graphic options and game options to editor settings

This is a small quality-of-life tweak that makes it so if you're in the
middle of editing a level, you don't have to save the level, exit to the
menu, change whatever setting you wanted, re-enter the editor, and type
in the level name, just to change one setting. This is the same as
adding Graphic Options and Game Options to the in-game pause menu,
except for the editor, too.

To do this, I'm reusing Game::returntopausemenu() (because all of its
callers are the same callers for returning to editor settings) and
renamed it to returntoingame(), then added a variable named
ingame_editormode to Game. When we're in the options menus but still in
the editor, BOTH ingame_titlemode and ingame_editormode will be true.

desktop_version/src/editor.cpp

@@ -3769,6 +3769,25 @@ static void editormenuactionpress()
             graphics.backgrounddrawn=false;
             break;
         case 6:
+        case 7:
+            /* Graphic options and game options */
+            music.playef(11);
+            game.gamestate = TITLEMODE;
+            game.ingame_titlemode = true;
+            game.ingame_editormode = true;
+
+            if (game.currentmenuoption == 6)
+            {
+                game.createmenu(Menu::graphicoptions);
+            }
+            else
+            {
+                game.createmenu(Menu::options);
+            }
+
+            map.nexttowercolour();
+            break;
+        default:
             music.playef(11);
             game.createmenu(Menu::ed_quit);
             map.nexttowercolour();