* Split Bootstrap code from CoreRuntime
* Make ContentService method signatures match interface
prevents need to hide the concrete class in tests
* Remove Current
Only bit that bugs me is TreeNode for IconFilePath
I get the feeling it's dead code, but can just use a setter in cs or work out path in js if required.
* Fix tests, remember to terminate IRuntime
* 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>
