* implemented built-in serial receivers support in SITL
implemented FC Proxy for SITL
update SITL.md
* Update SITL.md
* Update SITL.md
* Update SITL.md
* Update SITL.md
* [SITL] update POSIX serial functions to support non-standard baud rates
* disable xon/hof on serial port (SITL serial_proxy)
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Co-authored-by: Jonathan Hudson <jh+github@daria.co.uk>