IAX protocol

Changelog:

. 0.2.0.0
  + Allow more than one protocol instance

. 0.1.3.0
  + Added protocol icons
  + Added popups
  * Fix for connection after connection failed

. 0.1.2.0
  * Fix for wrong voiceservice version
  + Added protocol icon (thanks Angeli-Ka)

. 0.1.1.0
  * Small fixes
  * Compatibility with new voice service

. 0.1.0.0
  + Initial version