Speed up I2C by not setting the MCP23008 bits one at a time. #80
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Fixes Message draw slow compared to legacy library (Adafruit_CharLCDPlate) #55.
Sets all the MCP23008 gpio bits at once to speed up I2C.
Cleans up backlight initialization.
A user in discord was using an MCP2221 and this library was unbearably slow. I hope this is somewhat better. I gave them a .zip to test.