* Pro version: Add an option to add icons to submenu items. By default, they will only show up when selected manually (custom icon URL). The user can switch the icons to always-on or disable them through the plugin settings page.
* Submenu icons still need testing and layout adjustments. 
* Standardize all "admin_menu_editor-..." filters to use a dash as a separator instead of an underscore.
* IE: Fix strange boxes showing up in the icon selector.
* Change the default menu icon to the generic Dashicons cogwheel. WP does not use the previous PNG cog icon any more.

git-svn-id: https://plugins.svn.wordpress.org/admin-menu-editor/trunk@940093 b8457f37-d9ea-0310-8a92-e5e31aec5664