Javascript puzzles: switch to a CSS-based drop-down system.

The previous control buttons and dropdowns based on form elements were
always a bit ugly: partly in a purely visual sense, and partly because
of the nasty bodge I had to do with splitting the usual 'Custom' game
type menu item into two (to get round the fact that if an element of a
<select> is already selected, browsers won't send an event when it's
re-selected). Also, I'm about to want to introduce hierarchical
submenus in the Type menu, and <select> doesn't support that at all.

So here's a replacement system which does everything by CSS
properties, including the popping-up of menus when the mouse moves
over their parent menu item. (Thanks to the Internet in general for
showing me how that trick is done.)

emcc.c

@@ -696,7 +696,7 @@ void command(int n)
                 midend_redraw(me);
                 update_undo_redo();
                 js_focus_canvas();
-                select_appropriate_preset(); /* sort out Custom/Customise */
+                select_appropriate_preset();
             }
         }
         break;