[XAP Prereq] info.json layout options

[tzarc]

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, and in this case primarily with @skullydazed due to their prior work in this area.

The info.json format needs to be modified such that rather than specifying multiple fully defined LAYOUTs, a single layout can be specified with "layout options" that are capable of removing and adding keys depending on the selection.

This enables a much smaller method of defining such layout combinations -- if a keyboard supported:

• 2U backspace or split backspace
• ANSI or ISO Enter
• 6U, 6.25U, 7U, or Tsangan bottom row

Then under the current format the info.json would need to define 2x2x4=16 layouts. A "base" with "options" would significantly decrease the amount of definitions required, as well as significantly lower the size of the embedded info.json blob for XAP.

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[tzarc]

Should also take into account whether or not certain layouts "swap out" keys for encoders, and handle those cases as well.