Godmode should probably use std::string (or STL container maybe) for SPI/Wire/UART data

The Arduino String class is only intended for string data currently. In particular, it cannot handle embedded 0x0 bytes, which you might very well want to send or receive. See arduino/ArduinoCore-API#111 and arduino/ArduinoCore-API#97. If those issues are fixed, the String class could still be used, though.