Update the project for v4

[foostan]

Summary

Update a lineup

• Corne Cherry hotswaping type
• Corne Cherry soldering type
• Corne Chocolate hotswaping type
• Corne Chocolate soldering type

Corne Light and Corne Classic are about to be discontinued. The concept of updates is

• Eliminate the Pro Micro and put the MCU(RP2040)
• PCBA support (this is left to each shop's policy, but we will try to make the parts layout PCBA-ready)
• Change the key pitch from 19mm to 19.05mm to make it more standard
• The original location of Pro Micro has been expanded to accommodate additional keys and rotary encoders.
• Not compatible with v3

TODO

Enhancement

• https://github.com/foostan/crkbd/issues/70
• https://github.com/foostan/crkbd/issues/131
• https://github.com/foostan/crkbd/issues/139
• https://github.com/foostan/crkbd/issues/135
• https://github.com/foostan/crkbd/issues/147
• https://github.com/foostan/crkbd/issues/150
• https://github.com/foostan/crkbd/issues/166
• https://github.com/foostan/crkbd/issues/33

Fix

• https://github.com/foostan/crkbd/issues/123
• https://github.com/foostan/crkbd/issues/58
• https://github.com/foostan/crkbd/issues/36
• https://github.com/foostan/crkbd/issues/133
• https://github.com/foostan/crkbd/issues/129

[sungo]

In the description, you have listed an update to build in the MCU. I recognize this isn't a democracy but I'd like to preemptively request a version without a built-in MCU. Having a socketed MCU let's me be flexible and do things like decide I want bluetooth everywhere and upgrade all my boards to nice!nano . Or drop in an rp2040 and switch to kmk/circuitpython.

[sungo]

(As a side note, thank you so much for keeping choc as a fully supported keyboard type.)