Folder, video and misc. improvements

Twan 34 pts

Folder, video and misc. improvements
Just a small update this time, it includes:
* Folders menu item now links to folders instead of awards.
* When adding menu items/attachments all form fields are sorted correctly.
* Current embed selection (on images page) is saved.
* While installing BrainyVidGen a separated start menu folder is created (it used to go in the BrainyViewer folder)
* The videos are now responsive, this can be disabled in Style section.
* The unsubscribe link in html mailings is now correct html.
* Mailing prefix and postfix can be pages.
* Folders can now be attachments and part of books. You can also comments on folders.
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