Create some handy twig global variables and functions to assist with theming#473

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gheydon wants to merge 3 commits intoagentrickard:8.x-1.xfrom

heydon-consulting:8.x-1.x-twig

Commits on Mar 5, 2019

Create some handy twig global variables and functions to assist with theming.
gheydon
committed

Commits on Mar 12, 2019

Fix up issue when there are no domains configured.
gheydon
committed

Commits on Sep 12, 2019

Fix up the return from ::getFunctions() to be an array.
gheydon
committed