This reimplements components/captouch into a separate BSP-based captouch
driver.

New features:

 1. Interrupt-driven, which seems to improve performance.
 2. Has ability to run multiple sequences one after another on the
    AD7147. This is needed to support 13 channels on the bottom captouch
    controller. However, this seems to be currently broken (see BUG).

Whoops, this shouldn't have happened. Sorry.

Also rename the arg of mp_input_set_source() from enable to source

And remove a password from badge_link.pyi

Apparently this is what we have to do to end up with correctly split
flags being passed into micropython qstr machinery...

We're going with spirals for the production model, and the code fork
doesn't make much sense anyway, as it all ended up being the same (so
far). Whenever the behaviour between spiral/spikes changes, we should
just drop support for spikes.

This is the most common badge prototype version at this point.

We have newer badges available for everyone to develop against, and p1
is so different from everything else that it's really not worth
maintaining support for it anymore.