Change Wonderflux admin menu ID

Change ID of menu added to WordPress admin menu.
New function wfx_admin_bar_files_info() adds theme files in use to admin bar

When WF_DEBUG constant set to true, wfx_admin_bar_files_info() shows theme files in use, with file source label (i.e. Wonderflux/child theme). Shows core template file and files included with get_template_part() and wfx_get_template_part() in current view - adds to Wonderflux admin bar menu.