v0.4 dependents compatiblity

v0.4 Eco Checks

I have run unit tests for all direct dependents against v0.4 as of the latest commit on my latest PR.

As you can see, most packages nearly require a compat bound bump. A few are using the deprecated
function parentlinks and likely require only a simple change.

At the moment it seems there are only two non-trivial cases:

• BehaviorTree: this uses ShadowTree, a data structure which I did not understand the reason for
  in the first place. I expect that whatever it was doing can be easily replaced, but I'll have
  to take a look at this package to see what the v0.4 equivalent will be.
• Convex: this uses treekind which suggests that it is one of the only packages using indexed
  trees, and therefore is likely to require a non-trivial update.

✅ AutocorrelationShell

✅ BasisFunctions

factorial(::Float64) method error that happens even for v0.3

❌ BehaviorTree

uses ShadowTree

✅ Casciadia

✅ CombinedParsers

✅ ConstituencyTrees

✅ ConstructiveGeometry

Unrelated error, same thing happens on v0.3

❌ Convex

treekind not defined

✅ D3Trees

✅ DataDepsGenerators

unrelated error, same thing on v0.3

✅ DataSets

✅ DecisionTree

✅ DocumentationGenerator

unrelated error, same thing on v0.3

✅ DocumenterTools

unrelated error, same thing on v0.3

✅ ExprOptimization

✅ ExprRules

✅ ExtendableGrids

unrelated error, same thing on v0.3

✅ Eyeball

✅ FeynmanDiagram

I'm getting a parquet-related test error, but exactly same error on v0.3.

✅ FileTreees

❌ FlameGraphs

parentlinks not defined

✅ FoldingTrees

✅ Flux

✅ GenericTensorNetworks

unrelated error, same thing on v0.3, lots of passing tests

✅ GraphRecipes

✅ Gridap

✅ GridapEmbedded

✅ Gumbo

✅ HMatrices

✅ HalfEdges

unrelated error, same thing on v0.3

✅ HssMatrices

✅ ITensors

❌ ImageComponentAnalysis

expects parentlinks

❌ InfiniteOpt

expects parentlinks

✅ InteractiveErrors

✅ JSServe

Seems to have unrelated errors, but testing is a dependency mess, not completely sure.

✅ JunctionTrees

✅ KeywordSearch

❌ LeftChildRightSiblingTrees

expects parentlinks

✅ MathML

✅ MathTexEngine

✅ MetaUtils

✅ MethodAnalysis

❌ ModelingToolkit

depends on LeftChildRightSiblingTrees

✅ MultiScaleTreeGraph

expects parentlinks

❌ NewickTree

expects Tree

✅ OMEinsum

✅ OnlineStats

✅ OnlineStatsBase

✅ PDFIO

❌ PProf

depends on LeftChildRightSiblingTrees

✅ PSID

unrelated error, trying to fetch remote stuff

✅ Parquet2

✅ PatchMixtureKriging

✅ PhysOcean

❌ PlutoProfile

depends on LeftChildRightSiblingTrees

✅ ProjectEulerUtil

✅ QXContexts

seems to have packaging issues

✅ QXTools

✅ ReinforcementLearningBase

✅ ReinforcementLearningCore

✅ ReinforcementLearningExperiments

✅ ReinforcementLearningZoo

✅ Remarkable

requires 3rd party remote service to test

✅ RewriteTools

❌ SIIPExamples

depends on LeftChildRightSiblingTrees

✅ Scruff

✅ Skans

✅ SymbolicUtils

depends on LeftChildRightSiblingTrees but still passes

✅ TSML

✅ Taxonomy

✅ TimeDag

unrelated error, same thing on v0.3, passes lots of tests

✅ Transformers

❌ TreesHeaps

expects parentlinks

✅ Tries

✅ UnROOT

❌ WRDSMerger

expcts parentlinks

✅ WavePropBase

✅ Wordlegames

✅ XML

Start by reviewing the v0.4 compatibility findings in this issue and the affected dependent packages, especially BehaviorTree, Convex, and packages expecting parentlinks or treekind. Compare their current APIs with the v0.4 changes; done means the listed non-compatible dependents work against v0.4 without those reported errors.