448 protected DriveMode from None throttle or steering

493 updated rpi install docs to use buster

removed self arg from map_frange and moved map_frange to utils

add configs for PiCamera arguments: vflip & hflip

Update setup_mac.md

Fix URL to Apple logo.

Fix broken "Roll Your Own" link on supported_cars page

Small change - added 90, 99, 99.9 percentiles to performance statistics.

Fix broken link to "Roll Your Own" page

Fix typo vebose -> verbose.

Performance improvement of PWMThrottle and PWMSteering 

Support PWMThrottle and PWMSteering as threaded part to improve performance. Minor (most whitespace) code cleanups (pep-8).

Update README.md

Fix image extension, since they are lowercase now.

Travis update

Documentation: Editing myconfig.py without changing directory

The previous page of instructions could mostly be copied and pasted into terminal and would work. This small change allows that to continue for this line.

black - The uncompromising Python code formatter.
https://github.com/psf/black
It requires python 3.6 or newer, though