Add AVR-libc hardware i2c support and example project #910
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Hello Oli - thanks for AMAZING library!
I've added AVR-libc implementation of hardware i2c for communication, and an example for atmega328P and SSD1306 128x32 OLED.
In my private repo I made some experiments with ELM-CHAN's xprintf functions and u8g2
https://github.com/QB4-dev/AVR-misc/tree/master/avr-i2c-oled
Maybe it's worth to implement them in u8g2 as standard printf functions for non-Arduino projects?