displayio: make 'rotation' property settable

[jepler]

Discord's andyleer and I both recently noticed that it is not possible to set the rotation property of a
display. This is inconvenient if you want to change the rotation, as you have to copy the initialization from core C code into Python. Since e.g., the Pynt's blurb on adafruit.com says

Rotate it 90 degrees, it’s a web-connected conference badge #badgelife.

we should probably make it easy.

This lightly tested change does that, including resizing the terminal when you do. If you've got your own Groups displaying, you may need to reinitialize them. (I only tested it with terminal or with resetting the displayed group immediately)

(I also want to use this as a workaround for #2386 in JEplayer, I'll just flip the display orientation to the one that is faster)

[tannewt]

Will this cause a refresh if the displayed Group is from the user?

[jepler]

@tannewt Yes, this program continually rotates the given text in 90 degree increments, automatically refreshing:

import board
import displayio
import terminalio
import time
import adafruit_display_text.label

g = displayio.Group()
l = adafruit_display_text.label.Label(font=terminalio.FONT, text="hi mom")
l.x = l.y = 32
g.append(l)
board.DISPLAY.show(g)

while True:
    board.DISPLAY.rotation = (board.DISPLAY.rotation + 90) % 360
    time.sleep(1)

[tannewt]

Awesome! Thanks!