Add support for small 0.66" 64x48 OLED

[asmagill]

Adds displayio support for 0.66" 64x48 OLED displays. Works for 0 and 180 rotation; I suspect 90/270 requires additional changes in logic deeper in displayio and I don't require this yet, so I haven't pursued it.

Tested with https://www.amazon.com/gp/product/B07QF7QK6P/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1 (currently unavailable) and a replacement screen (same logic board) from https://www.buydisplay.com/small-0-66-inch-white-64x48-oled-display-module-ssd1306-serial-spi-i2c.

[dglaude]

I think you should also update the documentation part on the top of the file to say that it is now working with 64x48 and the link you provided. It is the "Hardware" section.

Please notice that I have burned my 0.49'' 64x32 and I have no way to test anymore if the code continue to work. Also, I am almost sure I never tested rotation in my code, so it is great that you tested at least some (180) of the rotation in this update.

[tannewt]

Please use pre-commit to standardize the formatting: https://learn.adafruit.com/improve-your-code-with-pylint/check-your-code-with-pre-commit

[asmagill]

% pre-commit run --all-files black....................................................................Passed reuse....................................................................Passed check yaml...............................................................Passed fix end of files.........................................................Passed trim trailing whitespace.................................................Passed pylint (library code)....................................................Passed pylint (example code)....................................................Passed pylint (test code)...................................(no files to check)Skipped 

[tannewt]

Thank you!