* 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.

* Add workspace.fontAliasing configuration option

Add simple boolean configuration option that controls how fonts are being rendered in workbench.

Enabling this option in configuration results with more native feel on macOS.

* Add different modes for workbench.fontAliasing

Support both additional "antialiased" and "none" methods on font antialiasing. Leaving subpixel-antialiased as default

See #2577

* Apply workbench.fontAliasing on document.body

Instead of using only workbench element, apply font aliasing setting globally on entire window.

See #2577

Support add folder to workspace only in multi root workspace