Revert "Revert "Move pretty printing of ast nodes to ASTNodes""

This reverts commit 853c20d7332cf5d46a7752ceb04352defb9e543a.
Make Pretty take an inner doc gen for rendering child nodes

o Makes ASTNode render using default
o Factors out ToString concern more clearly
Moving ast doc pretty printing to doc builders again but this time using the converter pattern
Pretty-printing collections
Fix astDocBuilder to properly pretty print nested values
Add astStructureDocBuilder for printing both ast and structure
Various pretty printing tweaks

o Support ast.Parameter
o Disable astStructureDocGen for now
o Add Doc.noBreak
Extract core of perty function composition into separate bling package

o Improves error handling
  o Uses total functions to Option to be more aware of error situations
  o Inline with concrete docGens instead of weird outer wrapper
    (error handling is a docGen local concern with a sane default)
o Replaces all of docbuilders and docgenerator types with new DocGen[-T]
o Temporarily disables ast support
o Rename HasDocFormatter => DocFormatting
o Rename HasDocGen => DocHandler
o Rename ASTTerm => ASTPhrase
o Prepares ast printing to use converter pattern (not hooked in / commented out)
Ported tests to use new perty
Fixed minor race in ArrayQueueOutOfOrderSequence
Highlight node on hover using CSS.
Highlight relationship on hover using CSS.
Make relationship caption changeable.

Get relationship caption from template.
Add relationship properties list to inspector.
Hard code '{type}' to default relationship caption.
Merge pull request #2994 from lutovich/fix-minor-race

Fixed minor race in ArrayQueueOutOfOrderSequence
Reverse highligt colors and reuse existing yellow.
Fix: when using page cache in store migration or tools make sure the sweeping thread is running

Registers created standalone page caches in a supplied LifeSupport so that they can be stopped later
Style play-topics the same way as help-topcis
Persist config changes
Dropdown for downloading either JSON or CSV
Merge pull request #2975 from davidegrohmann/2.2-fix-page-cache-usage

Fix: when using page cache in store migration or tools make sure the sweeping thread is running