Start changelog for 3.0 release.
sbc: b/f: reply 100 Trying to in-dlg msgs which are to be relayed

Conflicts:

	apps/sbc/SBC.cpp
sbc: fix 3930ca2 - only reply 100 Trying to in-dlg INVITE to be relayed
uac_auth: added UAS authentication of requests (internal API)

Conflicts:

	core/plug-in/uac_auth/UACAuth.h
	core/tests/Makefile
core: AmSipMsg gets ArgObject as base (for passing in DI calls)
sbc: SIP UAS authentication for B leg (uas_auth_bleg_enabled)

Notes:
- All of those profile options must be set
 uas_auth_bleg_realm
 uas_auth_bleg_user
 uas_auth_bleg_pwd

- On realm mismatch, it is not authenticated

- URI is not checked against the Authorization URI

Conflicts:

	apps/sbc/SBC.cpp
	apps/sbc/SBC.h
	apps/sbc/SBCCallProfile.cpp
	apps/sbc/SBCCallProfile.h
	apps/sbc/etc/transparent.sbcprofile.conf