Support BT21605 (PCF2119x controller)

FYI https://github.com/jlz3008/LCDi2c_PCF2119x

Hi,

I applaud your efforts, but lcds with HD44780 chips and i2c backpacks are cheap and easilly available supporting displays up to 40x4 characters and an established Arduino library. What are the advantages of your suggested displays?

Paul