Move AGI static documentation to the new AstXML form.

Move AGI commands documentation to XML docs:
'set priority'
'set variable'
'stream file'
'control stream file'
'tdd mode'
'verbose'
'wait for digit'
'speech create'
'speech set'
'speech destroy'
'speech load grammar'
'speech unload grammar'
'speech activate grammar'
'speech deactivate grammar'
'speech recognize'



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@196585 65c4cc65-6c06-0410-ace0-fbb531ad65f3