Revert "Switch-timed: switched to ATtiny10 SOT23-6."

This reverts commit 7426c306dc58e77c9809db77e26f6b62b76c1d9c.

C + ATtiny10 not supported by avr-gcc
Revert "Pot-timed (single board): switched to ATtiny10 SOT23-6."

This reverts commit c61ef78eb5273ce0300997b1b0118eed30148325.

C + ATtiny10 not supported by avr-gcc