Arcade Mode palette notes:

-- palette use:
-- 0: shallow sea blue (1)
-- 1: black (for sprites)
-- 2: dolphin shading
-- 3: azure water, maybe score display? (140)
-- 4, 5: keep default in sky layer (for emergency awakener)
--   4 (underwater) is a deeper blue shade part of sea
-- 6: dolphin specular highlights
-- 7: dolphin white paint
-- 8, 9: unassigned, layer specific
-- 10: word primary (yellow 10?)
-- 11: word shadow (wood 132?)
-- 12: dolphin eye
-- 13: common sky color
-- 14: dolphin primary color
-- 15: highlight white (all layers)
--
-- dolphin colors are different
-- between zones; correlated.
-- wave, text, and black colors
-- are the same between zones.
-- other colors are for
-- elements that only ever
-- appear in one zone.
--
-- TODO: consider changing sky
-- colors in different stages;
-- document what colors those
-- are (nrm_pal) if so.


Zonk Mode palette notes:

0: bg
1, 2: dark primary bg, primary bg
3: accent bg
4: keep default (for awakener timer); alt. accent
5: keep default; blending color
6, 7: keep default
8..11: fade-in colors
12: final shadow color
13: final accent color
14: final normal text color
15: final slow-fade text color

fade-outs are screen space palette changes on 12..15.