A) Refactor hue/chroma specification to support specification of
hue rotation and chroma depending on source color hue. Update vibrant &
expressive specs to use granular specification of hue rotations for
secondary and tertiary palettes for both, and expressive's neutral uses
specification of chroma for the neutral palette.
B) Use chroma equal to seed color for all palettes, replacing some
usage of >=
C) Remove chroma 40 cap at tone 90
Test: atest ColorSchemeTest
Bug: N/A
Change-Id: Ib9fff483443ccae888faf636d4388b9658ff3dfe
d6dbd50abc