ICE Stacks merge

Today we have 2 ICE stacks that are quite similar yet different. The goal is to merge those 2 into one nice ICE stack:

The work will be done in 3 phases:

1. merge the two stacks, with the current feature set
2. delete trice in librew
3. add more features

libre ice	librew trice	Goal	Status
Full mode, Lite mode	Mode agnostic	Full mode
Regular and Agressive nomination	Regular/Aggr. Nomination	Regular Nomination	-
UDP-only	UDP and TCP	UDP only
Media-only struct icem	Media-only struct icem	Media-only	DONE
Gathering in app	Gathering in app	Gathering in app	DONE
No Trickle	Trickle	Trickle
Sockets bind to 0.0.0.0	Bind to interface	?
Default candidates	No default candidates	?
Multiple components	Multiple components	One component (1/RTP)
ICE mismatch detection	-	?
role conflict resolution	role conflict resolution	role conflict resolution

Target specifications (Phase 1):

• RFC 5245
• draft-ietf-ice-trickle-07

Features for Phase 3:

• RFC 8445
• TLS-candidates
• DTLS-candidates
• [Done] decode STUN/TURN URIs (RFC7064, RFC7065)

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