freetdm: - updated all signaling modules (except for ftmod_isdn and ftmod_sangoma_ss7) to adapt to new core state processing
         - fixed bug in configure.ac to detect ftmod_pritap compilation
         - ignore FTDM_SIGEVENT_RELEASED and FTDM_SIGEVENT_INDICATION_COMPLETED in mod_freetdm
         - Destroy the state completed interrupt on channel destroy
         - Fix analog polarity reversal bug when using 3-way calling or call-swap