* Add template system for tab descriptions. (#12965)

* Add a boolean flag to onConfigurationChanged to prevent updates during initialization.

* - Change configuration key to 'workbench.editor.tabSubtitle'.
- Change configuration type to the enum ['default', 'short', 'medium', 'long']
- Move path logic into FileEditorInput.
- Move configuration handling into GroupService/ITabOptions.
- Refactor duplicate path shortening logic.

* Don't consider empty-string descriptions during de-duplication. Don't show subtitle when all descriptions are identical.

* Minor fixes and documentation.

* Update definition of Promise in winjs.base.d.ts.

* Update to new Promise declaration

* Fix remaining errors.

* move watermark to resources folder

* add to build

* 💄

* update distro

* update distro

* Addresses #26184 - use configuration for pinned default

* Honors the preview editor setting above all

* Removes passing undefined to pinned internally
re: requested code review changes

* Removes unnecessary undefined

* feedback

Refactors TextEditorOptions.fromEditor to a static method instead of an instance method. This method is only called after creation of the options object and currently requires using a weird cast in a few places

TS 2.3.1 introduced a breaking change by [switching to covariant types for callbacks](https://github.com/Microsoft/TypeScript/wiki/Breaking-Changes#covariance-in-callback-parameters). This change tries to fix these compiler errors in the workbench codebase

fixes #22049

fixes #21762

Replace the editor that is at the given position - Switching user and workspace settings when settings editor is open in more than one group

Also uses the tab close button option to position the dirty indicator