Tentatively adapt to Modus 4

FTR, things that I expect to need further tweaks and/or discussions
with Prot:

(a) no "version" command, so it's kind of hard to guess what we are
    working with programmatically,

(b) preset palettes overrides are unavailable before loading the
    themes, and we can't require 'modus-themes either; maybe the
    manual should point out that users who want to use those presets
    should (1) do that in :config (2) load the theme twice?

(c) lots of backgrounds look very light/saturated to me even in the
    "faint preset": e.g. diff backgrounds, selected completion,
    region, eldoc current argument.

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