* fix W391
* E262
* E703
* W293
* some E
* E231
* some more E
* E225
* more E
* E252
* no tabs
* more tabs
* E701
* uds.py
* almost all of them
* only e265 left
* not sure why this is triggering on commented out code
* ignore esptool
* Added pyflakes and Pylint for python
* Actually run linter in CI
* some simple pyflakes changes
* Add flake8 to panda reqs for linter test
* flake8 errors are fixed
* run flake8 in regression tests
* meant to run flake8
* hack to ignore unused import
* bug
* fix bugs in tucan_loopback
* Another fix by using set_safety_mode
* added pylintrc file
* more fixes and enabled pylint as well
* Fix pylint in circleci
* added linter to readme
* Fixed UART overrun error
* Added stability test scripts
* Refactored UART code. ESP/GPS now uses DMA in circular mode to directly write into the ring buffer, saving a bunch of interrupts and potential race conditions.
* Changed stability test to use amount of bytes instead of amount of non-zero messages, since the ring buffer pointer is only updated on half or full DMA transfer or on line idle (e.g. no more 1 char messages from the gps)
* Increase data limit. It's too low sometimes in normal operation
* Forgot to set write pointer in ring buffer
* Increased test limit even more
