Fix possible pin conflicts

[pazi88]

This PR mostly affects possible pin conflicts on STM32, but should be good addition on Teensy too.

• Add SD-card SPI-pins to STM32 pinIsReserved -list (if used)
• Use pinIsUsed -list instead of pinIsOutput -list for selectable inputs. (this adds the pinIsReserved and mandatory analog sensor pins for the list of pins that can't be selected)
• For features that have selectable output pins, only set as output if needed and check if pin is in the pinIsReserved -list