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extend i2c write interface

protocol inspired by i2c eeproms (e.g. CAT24AA... from onsemi)

I2C Start Adress Highbyte pixel address Lowbyte pixel address red green blue ... I2C Stop
- the address is incremented in the slave as long as the master keeps writing data - at the end the address wraps around - for now no read implemention

remove unnecessary pin assignments

Because of unused pin assignments the following warnings occur during compiling:

Warning (13034): The following nodes have both tri-state and non-tri-state drivers
Warning (13039): The following bidir pins have no drivers
Warning (13009): TRI or OPNDRN buffers permanently enabled
Warning (13024): Output pins are stuck at VCC or GND
Warning (21074): Design contains 16 input pin(s) that do not drive logic
Warning (15714): Some pins have incomplete I/O assignments. Refer to the I/O Assignment Warnings report for details

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