* follow up title part changes

* title - go back to having a part in electron-browser

Co-authored-by: NMatt Bierner <matb@microsoft.com>

cc @roblourens as the owner of 'Experiments service (?)' :)

Fix #85946

Fixes #91936: Do not emit empty tokens in the model, add workaround for rendering empty tokens in the view

Adds follow/unfollow actions to the timeline view
Reworks timeline view commands

fixes #87092

unit test to ensure encoding of markdown uris is correct, https://github.com/microsoft/vscode/issues/90855

When generating markdown, then only decode domURIs, https://github.com/microsoft/vscode/issues/90855

This clarifies that the type is an aggregate over inputs and not editor controls.

* IEditor => IEditorPane

* More panes:
* IVisibleEditor => IVisibleEditorPane
* ITextEditor => ITextEditorPane
* ITextDiffEditor => ITextDiffEditorPane

* imports - remove type alias

* More pane renames
* IEditorService#activeControl => activeEditorPane
* IEditorService#visibleControls => visibleEditorPanes

* More editor renames
* activeTextEditorWidget => activeTextEditorControl
* visibleTextEditorWidgets => visibleTextEditorControls

Fixes #91670

- Move model type logic out of `CustomEditorInput` and into two different implementations of `ICustomEditorModel`
- Add `CustomTextEditorModel` that owns a proper model reference to a text document. This should ensure the text document is disposed of if there are no more references to it
- Move most of the previous `CustomEditorModel` into `mainThreadWebviews` directly. This removes some of the indirection that was previously required (such as using `waitUntil`)

Possible fix for #89038/#91506. In both cases, it looks like we try to use the protocol before it is properly registered. If this fix doesn't work, there's probably something weird going on on the electron side of things