* asterisk-modules uses /usr/lib/<triplet>/asterisk
* apps/*.c: from upstream asterisk_20.1.0~dfsg+~cs6.12.40431414-1~bpo12+1
* use dh_asterisk provided by asterisk-dev to
set the proper version asterisk dependency
* refresh patches
* update debian/changelog
Change-Id: Ib8becab169fdf4408b07fce26c814339cd10eb46
* port app_voicemail and app_playback
to support Asterisk 16 (Debian/buster)
* rename .diff files into .patch for consistency
Change-Id: Ic5260e68f5a77d1640480e338dad44de4ae3b789