Issue #1912536 by vollepeer, derheap | taslett: Remove all references to the (removed) user-picture.html.twig file.

Issue #1898052 by jenlampton, taslett, Cottser, Pierre Paul Lefebvre, c4rl, joelpittet: Convert color module to Twig.

Issue #1898060 by taslett, jenlampton, Cottser: Remove all (useless) theme functions from dblog module, so we don't have to convert to Twig.