Pigeon abstraction layer (#1977)
* pigeon abstraction layer
* Fix string literals
* more generic pigeon class
* add TTYpigon
* nicer tty error handling
* close tty fd on pigeon delete
* pigeon receive return std::string
* use sizeof
* max receive size to prevent infinite loop
* remove namespace
* add unistd include for usleep
* fix is pigeon
* Handle tty error in opening
* fix printing binary strings with dump.py
* fix pigeon build on macos
* Handle errors seperately
Co-authored-by: Comma Device <device@comma.ai>
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Adeeb Shihadeh
Dean Lee
Willem Melching