Bring in the new loader code as described in mantis #4377

and updated to today's version.

The core of the patch is only two files, loader.c
and include/asterisk/module.h, with the other files
touched only to adapt non-standard usages of the
reference counts and localuser lists.



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@15784 65c4cc65-6c06-0410-ace0-fbb531ad65f3