ICE restart support

[paullouisageneau]

ICE restart support (see RFC 8445 2.4.) should be implemented.

[sinFunc]

1. the connection is ok, then two peers can send the message to restart ICE.
2. the connection is not ok,it must be restarted by user, here is my solution, destroy current agent and create a new agent,but it must handle the problem of multi-threads.so i wonder if there is any others way?

[paullouisageneau]

1. the connection is ok, then two peers can send the message to restart ICE.

2. the connection is not ok,it must be restarted by user, here is my solution, destroy current agent and create a new agent,but it must handle the problem of multi-threads.so i wonder if there is any others way?

This is unrelated to ICE restart, which keeps the same agents but gathers new candidates and selects a new candidate pair.