Add ALLOW_LEGACY_OUTBOUND compatibility for stock RustDesk clients that do not register a local controller identity. Keep the path disabled by default, restrict it to open enrollment, force relay, and retain one-use relay ticket authorization.
Refs #427
Refs #358
Credit: @remoover via PR #358https://github.com/UNITRONIX/BetterDesk/pull/358
Thanks: INSOLVE (Honorary); Marco Jakobs (@jacotec); MyNameisStitch (@MyNameisStitch); Redspin (@playerumpknow)