* Moved adapters from Infra -> Core
* Allow Composition to accept a service collection instead of an IRegister
* Composition no longer takes IRegister as constructor arg
all tests passing
* Composition no longer implements IRegister
* Lose _uniques in Composition
* lose Composition OnCreatingFactory actions
* Clean up UmbracoCoreServiceCollectionExtensions & Composition
Less IFactory
* LightInject gone where TFW == netstandard2.0 || TFW == netcoreapp3.1
* Resolve dead code issues
* Rename IFactory methods to match IServiceProvider so they can be trivially swapped later.
* Rename IFactory methods to match IServiceProvider so they can be trivially swapped later (continued)
Thought the counts were low, it's mostly extension method usage
* Reorganised integration tests into folders and classes grouping by project.
* Updated namespaces and file locations from PR comments.
* Fix merge conflict
* Cleared content type service events looking to resolve failing integration test on build server.
Co-authored-by: Elitsa Marinovska <elm@umbraco.dk>
