ChibiOS version to use

[mtfurlan]

So right now the documentation for getting ChibiOS is inconsistent, and sometimes wrong.
The instructions in teensey_lc_onekey say to clone ChibiOS into tmk_core/tool/chibios/ChibiOS, and "This should be it", but a few days ago the master branch of ChibiOS didn't compile, so I checked out the most recent stable branch and it was fine.

All of the instructions I can find:

• https://github.com/tmk/tmk_keyboard/blob/master/keyboard/teensy_lc_onekey/instructions.md
• https://github.com/tmk/tmk_keyboard/blob/master/tmk_core/protocol/chibios/README.md
• https://github.com/tmk/tmk_keyboard/blob/master/keyboard/infinity_chibios/MEMO.txt

The first two just say to clone the official chibios and chibios-contrib into their directories in tmk_core/tool/chibios/, which as mentioned doesn't compile.

infinity_chibios says to use the kinectis branch, from https://github.com/flabbergast/ChibiOS.git, and not to use chibios-contrib.

How should all of this documentation be unified?
tmk/tmk_core#8 suggests that it should just be specified on a per-project basis, so like for teenskey_lc_onekey maybe the instructions should be something like

clone https://github.com/ChibiOS/ChibiOS somewhere
checkout branch stable_17.6.x or whatever
set CHIBIOS to that directory in your makefile

The per-project instructions also make sense cause infinity_chibios uses a very different version, and I'm doubtful it'll be reconciled.

[tmk]

Yes, we should have 'how to setup ChibiOS' at just one place to avoid confusion, and that part should be removed from the other two docs. Good palce is tmk_core/protocol/chibios/README.md or wiki.

TMK should work with latest stable of ChibiOS and keep up with master branch as possible hopefully.

infinity_chibios should work with official repo, its document is just old and not updated.