WIP: FEATURE: Refactoring for Neos 9

[mficzel]

The flowQuery operations referenceNodes() and backReferenceNodes in combination to search for documents that have similar taxons assigned.

similarDocuments = ${
    q(documentNode)
        .referenceNodes('taxonomyReferences')                  // the taxons the current document references 
        .backReferenceNodes('taxonomyReferences')              // all nodes that reference one of the same taxons
        .filter('[instanceof Neos.Neos:Document]')             // only documents
        .remove(documentNode)                                  // but nut the current one
        .unique()                                              // every document only once
        .get()
    }  

The package now includes the following flowQuery operations:

• referencedTaxonomies(): the taxons referenced by the documents in flowQuery context
• referencingTaxonomies(): the documents referencing by the taxons in flowQuery context
• subTaxonomies() : sub-taxons of taxons in the context
• withSubTaxonomies(): current taxons in the context plus sub-taxons

similarDocuments = ${
  q(documentNode)
    .referencedTaxonomies()                                // the taxons the current document references
    .withSubTaxonomies()                                   // including all sub taxons
    .referencingTaxonomies()                               // the documents that reference the same taxons
    .remove(documentNode)                                  // but nut the current one
    .get()
  }   

Must have:

• BE Module create, edit, delete, show Vocabularies
• BE Module create, edit, delete, show Taxonomies
• BE Module - Dimension switch
• BE Module - alphabetical order
• Command Controller
• Taxonomy Editor with secondary editor
• Update Documentation

Nice to have:

• BE Module - default node comparison
• BE Module - protect tethered nodes from deletion

For now the following two branches are needed for this to work:

• Neos !!! 9.0: Serious root nodes neos/neos-development-collection#4339
• Neos UI 9.0: Adjust to changed node path API neos/neos-ui#3530

[mficzel]

@ahaeslich i am usure about the names and interfaces of the flowQuery operations

• referencedTaxonomies(): Better naming and is there a need to specify the reference name and taxon type?
• referencingTaxonomies(): Better naming and is there a need to specify the reference name and document type?
• subTaxonomies(): Is there a need to specify the depth taxon type ?
• withSubTaxonomies(): Os there a need to specify the depth taxon type ?