Request: Fcast receiving support

[Quackdoc]

Fcast is a fairly new casting protocol that is an alternative to solutions like chromecast, The crate with info can be found here https://github.com/futo-org/fcast/

otherwise a working rust application and library for it can be find here https://github.com/MAlba124/OpenMirroring It is also GPL-3.0 so it shouldn't have licensing issues, even if you wanted to use to use fcast-lib from them instead of the one in fcast's repo.