nrf5/lcd: Updating framebuffer with double buffer for epaper displays. Moving statics into instance struct. Adding new function to refresh using old buffer, such that epaper can get a cleaner image after update.
nrf5/lcd: Updating framebuffer with double buffer for epaper displays. Moving statics into instance struct. Adding new function to refresh using old buffer, such that epaper can get a cleaner image after update.

adafruit/circuitpython,adafruit/micropython,adafruit/circuitpython,adafruit/micropython,adafruit/circuitpython,adafruit/circuitpython,tralamazza/micropython,tralamazza/micropython,adafruit/micropython,tralamazza/micropython,adafruit/circuitpython,tralamazza/micropython,adafruit/micropython,adafruit/circuitpython,adafruit/micropython