Cleanup transmit_callstate handling

Broke the various functions included in transmit_callstate to their own functions. Transmit_callstate now just transmits callstate.

Generally left the functionality as it was, which highlight some minor code issues (eg multiple transmit_callstate's). I did however revise the hint code usage of the old transmit_callstate as it it not appropriate to put a device on hook based on the change of a hinted device.

(closes issue #16939)
Reported by: wedhorn
Patches:
      skinny-clean04.diff uploaded by wedhorn (license 30)
Tested by: mvanbaak,wedhorn



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@251221 65c4cc65-6c06-0410-ace0-fbb531ad65f3