Optional pretty-printing

[wismill]

Currently we always pretty-print the keymap when serializing it, but it means more work to generate (computing paddings, human-friendly mask, etc.) and then more work to parse in the client.

We could make this optional:

• Use a minified¹ keymap for serialization by default in the API, with optional pretty-print using a flag.
• Use a pretty-printed keymap for all tools by default and a tool flag to turn it off.

The same could apply to Compose files.

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Not related to pretty-printing, but we could also consider to (optionally) drop some bits that are not used in the keymap, e.g. key types and interprets. Indeed, they would not impact the behavior of the resulting keymap in the client, but could cut a bit the serializing/parsing time. We should probably keep all the keycodes though, even if not mapped.

Footnotes

1. Keep the newlines, we are no monsters ↩