Added ability to specify a custom tools menu via conf/tools.php config

Create a conf/tools.php config such as this:

        ; <?php /*

        [Content]

        admin/pages = Pages
        blog/admin = Blog Posts
        blocks/admin = Blocks
        filemanager/index = Files

        [Administration]

        user/admin = Members
        navigation/admin = Navigation
        designer/admin = Designer
        translator/index = Languages
        admin/versions = Versions

        ; */ ?>

The regular Tools menu disappears and the toolbar becomes the hover zone
for a multi-column menu of tools. This is helpful for creating completely
customized CMS experiences based on the Elefant platform.