jQuery dynamic TABs for EDD backend - using edd_header_callback

This is a enhancement for the EDD settings panel. Especially useful for the extension section when a lot of Add-Ons are installed but the jQuery tabs are working on every section as well.

Tabs are created automatically. They use the edd_header_callback function for title and navigation and integrates seemless into the concept of extending EDD. No change in any EDD development paradigm is necessary to create this setting tabs.

There is still some place for improvements:
- Make this feature optional so people can decide if they want to use the original "static" list of settings or the dynamic one.

- The side bar navigation can be easily changed to a left to right navigation when backend is opened on mobile devices and i am sure the code can be improved as well.

I really love to see that feature in edd because it makes fiddling arround with dozens of options and extensions more comfortable.

**Preview (its currently used in my dev version of mashshare)**

![EDD Tabs](https://www.mashshare.net/wp-content/uploads/edd_tabs1.PNG)

![EDD Tabs](https://www.mashshare.net/wp-content/uploads/edd_tabs2.PNG)