Configurable pulls for AUX connector

[Qwerty-OFF]

Currently, pull-ups for analog inputs from the AUX connector are configured by soldering:

We can replace this with software-configurable pull-ups similarly to how it is currently done for the IN_D2..IN_D5 nets:

Then, switching between pull-up and pull-down can be performed from the software. However, to adjust values if necessary, a soldering iron will still need to be used.