* cleanup simulator files
* minor updates
* update readme
* keras runner builds
* hmm, still doesn't work
* keras runner works
* should work with python3 keras mod
* touchups
old-commit-hash: c50c71829375fbbbeacd0add7bfd7e3f04c57668
* 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
old-commit-hash: c42e2ecc50d72947719219e20a5e91ed9bf5fbf4