Carstate returns capnp struct (#1115)

* Before abstraction, adding speed init from VW as well

* strting to abstract carstate class

* fix bug and update lock?

* revert pipfile change

* another bug

* fix linter

* bug fix

* remove a bunch of diplicated kf code

* better to not have class vars. will abstract __init__ anyway later

* abstract common instance vars in carstate init and a generic gear parser static method

* abstract gear parser for chrysler

* abstract gm gear parser too

* remove unnecessary random vars

* Chrysler: carstate returns capnp struct directly

* revert ref commit

* test ref

* WIP

* more WIP

* ops, missed this conflict

* ford as well

* not sure why this got deleted

* no need to copy

* remove copy

* remove copy import

* remove unnecessary intermediate variable

* remove obsolete comments

* GM: have carstate returning capnp struct directly

* Honda carstate also outputing capnp struct

* hyundai too now returns capnp from carstate

* ops, not meant this

* Subaru carstate also returning capnp

* Toyota: capnp struct as output of carstate

* fix bool

* minor simplififcation in Honda

* no need to negate

* VW carstate returning capnp struct (#1118)

* VW carstate also returning capnp struct

* fixed typo

* Remove unused blinker button (#1119)

* remove unused blinker button

* ops, this wasn't meant

* remove blinker button for VW as well

* update ref

Co-authored-by: Willem Melching <willem.melching@gmail.com>

old-commit-hash: 0c67143c925f3ead6c3e88675e4fcfa4fa3f9c28

selfdrive/test/process_replay/ref_commit

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