related to #78168

For #77132

For #76442

Also: let the theme service not change classes on document.body but the actual container of the workbench

#74250

* Added command line information to display details about collected telemetry

* Telemetry tooling exploration

* Changing telemetry calls to be strongly typed

* Fixed an event definition

* Removed telemetry command

* More removing of telemetry command

* Fixed compilation errors

* Forgotten property

* Updated typings so diff was aligned

Part of #74250

- Extend `Disposable` in classes where it makes sense
- Use `DisposableStore` for lists of disposables
- Make `combinedDisposable` take arguments instead of an array (so that you can't pass in an array and then modify the array after the fact)

Fixes #74191

Instead of using a base64 encoded data uri to display images, use the fileService to read Buffer, convert this to a Blob, and display the blob