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/Game.h

@@ -442,8 +442,11 @@ public:
     bool glitchrunnermode; // Have fun speedrunners! <3 Misa
 
     bool ingame_titlemode;
+#if !defined(NO_CUSTOM_LEVELS) && !defined(NO_EDITOR)
+    bool ingame_editormode;
+#endif
 
-    void returntopausemenu(void);
+    void returntoingame(void);
     void unlockAchievement(const char *name);
 
     bool disablepause;