Container outlines are now a bit darker on light mode, providing

slightly better contrast. The "weak" outline is now equivalent to the

previous normal outline.
Weak text colors have had contrast reduced just a bit, helping it stand

out better from normal text on container backgrounds.
Light and dark link color variables are now provided, letting UIs use

them as needed.
A design token for sidebar item background colors has been removed, as

it wasn't used or fleshed out.

Been using these as part of the work in Review Board. Screenshots have

been taken with these definitions.