Add support for ATmega329P/ATmega3290P #427
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Both of these lack a hardware TWI and only come with USI instead.
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Hi, I hope you still accept contributions to u8glib even though u8g2 exists. If not, I could look into porting these changes over to u8g2.
Anyway, I've added support for the ATmega329P / ATmega3290P microcontrollers. The required changes are relatively minor; I've had to disable I2C because they lack a hardware TWI unit and had to modify the hardware SPI code because they use the same pins for MOSI, SCK and Slave Select as the ATmega128.
WIP because this is still missing hardware SPI pin adjustments for u8g_com_atmega_st7920_hw_spi.c.Done.