Use Bling to render decorations
No other changes to decorations yet. This helps to free PhocRender
and PhocOutput
from knowing what they're rendering further and keeps the decoration details to the new class so we can improve decorations more easily
Marking as draft until !478 (merged) is merged
Marking as draft as it's now on top of !522 (merged) there's a TODO in the commit messages and a test failure
Edited by Guido Günther