Shows an interface for editing a template or other theme file from the admin center.

• Accessed at index.php?action=theme;sa=edit (action=admin;area=theme;sa=edit in 2.0)
• Requires the admin_forum permission
• Uses the Themes template
• Part of the manage_themes adminIndex
• If no theme is specified in the URL (;th=theme_id), loads a list of all available themes and uses the theme_list subtemplate, giving the admin the option to edit index.template.php or style.css for each theme
• If a theme IS specified, loads up all files in that theme and lets the admin edit any of them that are appropriately chmodded (except images of course)