Trouble with static buffer sizes within the I2C libray.

_From @DieterBurandt on January 17, 2017 17:16_

(Arduino 1.6.18.1)

- I2C communication:

The I2C buffer has a fixed size of 32byte in the Arduino library. If you like to use an EEPROM with a page size of e.g. 128 byte, then you must patch the buffer size in the Arduino library.

Please implement a simple method, that the user can set the size of the buffer from within the project (AVR, SAM, and SAMD(?)).

(SAM: "Wire.h" => "#define BUFFER_LENGTH 32")

_Copied from original issue: arduino/Arduino#5871_

Start by reading Wire.h and locating the fixed BUFFER_LENGTH definition in the SAM core. Compare how the I2C buffer is defined in the AVR and SAMD cores, then determine how a project-level buffer size could be configured consistently. Done means users can set the buffer size without patching the Arduino library.

Written by the indexing model from the issue text.