Increasing EEPROM size from 1024B (1kB) to 4096B (4kB) to make it fully compatible with at24c32, at expense of longer write times after many entries have been written to EEPROM

Refactoring I2C target driver to enable handling of two different target addresses on the same I2C bus

Initial commit of processor companion utility (PCU) software, with source, build, and test tools. This initial commit includes support for EEPROM emulation over I2C.