sprinkle digit_timeout into switch_ivr_read and switch_ivr_play_and_get_digits and the higher level variants

fix switch_ivr_collect_digits_callback to allow an args pointer with null callback to work like other apis

  * Updated Uploaders list
  * Updated Standards-Version to 3.9.1

avoid segfault when sofia tries to update the callee id at the same time as the outbound call is transferred

add 'sofia global siptrace on' so we don't have to always teach people to enable sip trace on each profile