Implement XAP 'secure' core requirements (#16843)

Co-authored-by: Drashna Jaelre <drashna@live.com>
Co-authored-by: Stefan Kerkmann <karlk90@pm.me>

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

rgblight: Limit max repeat times in rgblight_blink_layer_repeat (#16860)

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

Resolve layout macro inconsistencies for rmkeebs/rm_numpad (#16856)

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

[Keyboard] Add avalanche (#16407)

* [Keyboard] Add avalanche

* PR feedback

* Update keyboards/avalanche/v1/config.h

* Update keyboards/avalanche/v1/v1.h

* Update keyboards/avalanche/v2/config.h

* Update keyboards/avalanche/v2/v2.h

* Update keyboards/avalanche/v3/config.h

* Update keyboards/avalanche/v3/v3.h

* Apply suggestions from code review

* Remove rules.mk comment and fix other comments.

* Shared encoder code, follow conventions in rules.mk files.

* Remove config files which do not change defaul behavior.

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

[Keyboard] Add via support for creatkeebs/glacier (#16747)

Co-authored-by: Joel Challis <git@zvecr.com>

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

[Keyboard] move/rename obro to Meridian RGB (#16828)

Co-authored-by: Joel Challis <git@zvecr.com>

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

Ignore VIA(L) json files (#16845)

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

Fix external flash on AVR (#16851)

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

[Keyboard] Fix kay65 - Missing keycode (#16849)

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

[Keyboard] Fix waffling80 - Missing comma (#16848)

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