Added new channel command FTDM_COMMAND_SET_POLARITY
ftmod_wanpipe - Added support to enqueue polarity events on FXO lines
ftmod_wanpipe - Added support to set polarity on FXS lines
ftmod_analog - Added support to answer and hangup FXO lines on polarity reverse
ftmod_analog - Added support to reverse polarity in the FXS line on answer and hangup
mod_freetdm - Added parameters answer-on-polarity, hangup-on-polarity and polarity-delay
to enable those analog features
* Replace ftdm_channel_flag_t with defines. We reached the 32bit limit where does not seem reliable
to keep using enum.
* Flags member for ftdm_channel_t is now uint64_t
* Added FTDM_CHANNEL_CALL_STARTED flag to indicate when the API user knows about a call
* Refactored raw_data member for ftdm_sigmsg_t. If raw_data needs to be freed it must be requested explicitly
through the autofree member
* Added collected member to ftdm_sigmsg_t for FTDM_SIGEVENT_COLLECTED data instead of using raw_data
* Created define FTDM_DIGITS_LIMIT for DNIS/ANI digits limit
* Fix some stat checks and outdated code in ftmod_analog
* Refactored ftdm_channel_get_history_str API to return the time offsets and time since last state change
* Do not send FTDM_SIGEVENT_STOP and FTDM_SIGEVENT_RELEASED on calls that were never reported to the user
Moises Silva