skypiax: now incoming CHATMESSAGE is transformed into a MESSAGE event, and sent to the ESL (fired) and, if we are in a call (if the session exists) is sent to the session too (from where you can get it eg: with inputcallbacks methods)

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@14876 d0543943-73ff-0310-b7d9-9358b9ac24b2