This type never modifies the input arrays

This function does not modify the input array

isArray should keep the output as readonly

This is due to this https://github.com/microsoft/vscode/issues/8017#issuecomment-499780142

Enable it in web

Part of #70248

The `MutableDisposable` class helps manage a disposable value that may change over time. I noticed that editorStatus was currently manually managing its `IStatusbarEntryAccessor` elements and think `MutableDisposable` can help simplify the code and prevent mistakes, such as forgetting to dispose of a property before re-assigning it

Fixes #70248

This is no longer required and complicates loading of resources. Use the standard `vscode-resource` scheme instead