A Mostly No Arduino ATtiny85 I2C LCD

This is hacked to all get out, but using some sometimes modded Arduino libraries as a start and info found all over the net, I finally managed to get my ATtiny85 talking I2C to a cheap I2C LCD. Why no Arduino? Because I want my own timer interrupts and the ATtiny Arduino core uses the timer(s?) I want to use for millis() stuff...

Here's some ATtiny I2C inspiration I found hanging around...

• https://platis.solutions/blog/2015/03/22/diy-interactive-name-tag/
• https://github.com/platisd/ATtiny85-LCD-library
• http://mythopoeic.org/adafruit-trinket-i2c/
• http://www.eevblog.com/forum/microcontrollers/good-usi-i2c-master-slave-attiny85-library-(optionally-master-arbitration-)/
• https://github.com/adafruit/TinyWireM
• http://codinglab.blogspot.com/2008/10/i2c-on-avr-using-bit-banging.html