[XAP] First boot initialisation

[zvecr]

XAP Task Info

Original Issue
Original spec document
Current XAP Definitions
Current XAP Generated Docs
Placeholder PR

Description

Any work in this area needs to be discussed with QMK Collaborators first.

Bind eeprom reset logic so that dynamic keymap is populated.

• reset condition?
  • enabled features?
• via -> stores date to detect "significant" firmware change
• xap version?
• introduce version for dynamic keymap format?

[tzarc]

Maybe now with the introspection capabilities, we can use a CRC over the keymap and encodermap and use that instead of the date?

[zvecr]

hash at runtime would work, be it going to burn more cycles on boot. Would be a little more targeted which has both upsides and downsides.

Implemented at 28855f6:

• variable keycode IDs depending on enabled features
  • enabled features somewhat need to be taken into account with the current keycode implementation
  • less of an issue with DD keycodes?
    • include keycode version in hash?

Maybe something like 2592402 at build time?

• maybe too aggressive in content it considers?
  • maybe "safer" due to unknowns of reset condition

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