* feat: adds a transmit and receive i2c method
* fix: address the i2c transmit and receive length on u16
* Add AVR/LUFA implementation
Didn't add a progmem version, since that would only apply to receive.
Figured it wasn't worth it, but can add.
* Rearrange order of functions
* Add docs
* Fix doc gen error
* Fix lint issues
* fix more lint issues
* avr i2c_master: Fix 1ms timeout
i2c_start() produces a minimum time_slice of 1ms for use as timeout
value.
The timer granularity is 1ms, it is entirely possible for timer_count
to tick up immediately after the last timer read and falsely trigger
timeout with a '>= 1' comparison.
* avr/drivers/i2c_master: Use timer_elapsed()
