IOIODude minor fixes.

Upgrade IOIODude to PJC 0.0.16.
A couple of typos.
DevBoot: Add a way to enter bootloader from app.

This is a developer-only feature: app firmware can
cause a reboot-into-bootloader by executing an
illegal op, e.g.:

asm (".pword 0x030000");
CapSense: Minor bug fix.

This bug prevented proper closure of CapSense channels.