Moved all the callbacks into the main module file. Fixes performance issues by calling module_list() and file_exists() on each module on every single request.

Moved and cleand up admin_select_admin_menu_output_alter() to main module file. Added token protection to the switching links.

#1284818 by phillipz, deciphered: Added Administration Menu select permissions.
#1140818: Added ability to set default by role.

Added Admin Menu optimized menu.

#1125012 by Dave Reid, deciphered: Rewrote core functionality and API.
Added API documentation.

Added a modular structure to support future Administration menus.