Console: Support page up/down and home keys for scrolling

- Page up/down scrolls up/down an entire page
- Home resets the scrolling back to the bottom.

The fact that these were missing was probably an oversight. Other
similar editors have them.

This works by including the "View2D Buttons List" keymap for the
console, which the other similar editors use as well.

source/blender/editors/space_console/space_console.c

@@ -121,6 +121,9 @@ static void console_main_region_init(wmWindowManager *wm, ARegion *region)
     region->v2d.cur.ymax = prev_y_min + cur_y_range;
   }
 
+  keymap = WM_keymap_ensure(wm->defaultconf, "View2D Buttons List", 0, 0);
+  WM_event_add_keymap_handler(&region->handlers, keymap);
+
   /* own keymap */
   keymap = WM_keymap_ensure(wm->defaultconf, "Console", SPACE_CONSOLE, 0);
   WM_event_add_keymap_handler_v2d_mask(&region->handlers, keymap);