fix rotation and mirroring
fix rotation and mirroring

now works with all vector shapes, even those with internal reference locations
that are negative. All shape locations are anchored to their 0,0 but they can
display pixels from negative coordinates if the shape's location on the screen
would have room for it.

adafruit/circuitpython,adafruit/circuitpython,adafruit/circuitpython,adafruit/circuitpython,adafruit/circuitpython,adafruit/circuitpython