backlight: split AVR PWM and timer drivers (#21540)

Merge remote-tracking branch 'upstream/master' into develop

Move files to rev1 folder, add rev2 (#21563)

Co-authored-by: Duncan Sutherland <dunk2k_2000@hotmail.com>

Get rid of `USB_LED_CAPS_LOCK` (#21436)

Merge remote-tracking branch 'origin/master' into develop

[Keyboard] Add Nyquist Rev. 4 (#21421)

Co-authored-by: Drashna Jaelre <drashna@live.com>

Merge remote-tracking branch 'origin/master' into develop

[Keymap] small changes, game layer for mattly keymap (#21375)

Co-authored-by: Ryan <fauxpark@gmail.com>

Fix encoder map declarations (#21435)

Reduce `keebio/bamfk1:via` firmware size (#21432)

Move miscellaneous defines to data driven (#21382)

Merge remote-tracking branch 'origin/master' into develop

Add Iris Rev. 8 (#21392)

Co-authored-by: Duncan Sutherland <dunk2k_2000@hotmail.com>

Move `TAP_CODE_DELAY` to data driven (#21363)

Move `RGBLIGHT_HUE/SAT/VAL_STEP` to data driven (#21292)

Co-authored-by: Nick Brassel <nick@tzarc.org>

Remove CORTEX_ENABLE_WFI_IDLE from keyboards. (#21353)

* Remove CORTEX_ENABLE_WFI_IDLE from the codebase.

* Turn on CORTEX_ENABLE_WFI_IDLE by default.

Merge remote-tracking branch 'origin/master' into develop

Keebio Cepstrum Configurator Touch-Up (#21310)

* [enhancement] remove redundant layout data

Remove the redundant layout data from the keyboard-level `info.json`.

* [enhancement] correct JSON syntax in rev1/info.json

* [enhancement] friendly-format rev1/info.json

* [enhancement] correct layout data

Remove encoder in-matrix workaround code (#20389)

Remove default `TAPPING_TERM` from keyboard config.h (#21284)