mpaland printf implementation was abandoned in ~2019 and the fork by
eyalroz is now regarded to be the goto replacement of it. So this commit
incoporates the changes needed to use this fork in QMK.
Note that pointer ptrdiff_t is always supported since commit
51c90f93a97fdaef895783ecbe24569be0db7cb8
* Don't make EEPROM size assumptions with dynamic keymaps.
* Add support for checking against emulated flash, error out if someone attempts to build a board without specifying EEPROM size.
* Reorder defines so that MCU is considered last.
* Refactor EEPROM definitions for simplicity.
* Fix max sizing of kabedon/kabedon980.
* Fix max sizing of mechlovin/olly/jf.
* Fix unit tests.
* Review comments, add messages with values during build failures.
* Add open-drain GPIO support.
* `qmk format-c`
* Wording.
* Remove port GPIO implementations as the only board that uses it has its own internal defs anyway. Will wait for first-class handling of ports in core before reimplementing.
