- remove ILineTokens.actualStopOffset
 - remove stopAtOffset
 - refactor MonarchLexer

* Add CompletionItemKind.Folder

Fixes #17435

Adds a new completion item kind for folder/directories. This is useful for path intellisense

For the icons, I copied the icons for folders into the suggestion icon set. Let me know if new ones are needed instead.

* Fix monaco.d.ts

In order to fix the linked issue some preexisting behaviours had to
be modified. The resulting overall behaviour now fits better to standard
implementations.

This fixes #17011