[x] five-state GPIO can be now (more) intuitively controlled by gpio_out(), gpio_pull() and gpio_highz() functions
[x] fixed a little bug that prevented the use of GPIO for stepper endstop
[x] RP2040-Zero board tested OK - troubles with oscillator start-up just required compilation against new (2023+) SDK
Full Changelog: v0.1.0...v0.2.0