Hardware wishlist grab bag

[kbob]

In the next rev, there are a couple of things I'd like to see. These are just suggestions, and I understand they may not be possible or cost-effective. Nonetheless...

1. Bigger text on the front silkscreen for power, volume, SD card, and headphone labels.

2. Connect the headphone presence pin to a GPIO.

3. Add LEDs above the SELECT and START buttons.

4. Replace the digipot and amplifier with an I²S codec w/ integrated amplifier and gain control.

5. Socket the 1Bitsy.