flashproxy-client needs to support SOCKS arguments primarily
At the moment, flashproxy-client takes a bunch of command-line arguments, that determine how it registers and talks to the bridge.
These should really be done in the Bridge line (and passed in via SOCKS arguments), since the argument values may change per Bridge. These include:
--facilitator, --facilitator-pubkey
--register, --register-*
--transport.
I would argue that the CLI arguments be deprecated. I would favour complete removal, but AIUI it is required for compatibility with older versions of Tor.
This may require #10671 (moved).