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.

Removes sdkconfig.p* files, use a single sdkconfig.defaults.

This is now 'overlaid' with flow3r-specific options by idf_ext.py.

As requested by moon2. Spikes is the default as that's what p4 uses and
the current code handles decently, spirals is new in p6 and ideally
should have its own implementations for rad and phi, right now it has
placeholders.

It was never actually supported by the codebase (the port expanders are
completely different and only implemented in the other repo)

This moves badge hardware generation selection over from a header file
into ESP-IDF configuratbility.

The generaiton can now be selected by specifying `BADGE_GENERATION` or
`-g` when running the initial built.

In addition, each generation now gets its own sdkconfig.defaults file
(instead named sdkconfig.$generation) and the big autogeneration
sdkconfig file gets yeeted.