* Shebang Fix
Per George's "I'd merge a PR replacing the 4 python3.7 with python3" on Discord. George updated Python to 3.8.2 for webcam tools, which broke manager from launching. Instead of chasing the exact version, it seems more reasonable to fall back to 3.
* More Python3.7's
* store athena connected-at time
* refactor
* deref
* dt import
* Athena status based on last ping time param
* upd test for pingtime
* lower error timeout
* too many if
* unused
* whitespace
* key
* sefldrive/car/*
* no more gctx
* lower
* start abstracting common events
* all cars
* start small
* all cars
* reverse gear
* wrongCarMode
* wrongGear
* espDisabled
* steerUnvailable
* make linter happy
* c isn't used
* fix esp_disabled in VW
* update ref
* more red
* more cleanup
* fix subaru
* update ref
* use the openpilot/persist directory on PC
* manager runs on mac
* sim runs w/o carla
* fix params location in test
* that rmtree can fail and it's okay
* refactor params clear functionality
* set PARAMS_PATH