Semantic Tokens support

These will be rather questions than issues @rubenporras

There is no support for workspace/semanticTokens/refresh message. At first I thought it is easy to add. I've tried the following the LangugeClientImpl:

	private void updateSemanticTokens() {
		for (IWorkbenchWindow window : PlatformUI.getWorkbench().getWorkbenchWindows()) {
			for (IWorkbenchPage page : window.getPages()) {
				for (IEditorReference editorRef : page.getEditorReferences()) {
					IEditorPart editor = editorRef.getEditor(false);
					if (editor != null) {
						ITextViewer textViewer = UI.asTextViewer(editor);
						if (textViewer != null) {
							textViewer.invalidateTextPresentation();
						}
					}
				}
			}
		}
	}

	@Override
	public CompletableFuture<Void> refreshSemanticTokens() {
		return CompletableFuture.runAsync(() -> UI.getDisplay().asyncExec(this::updateSemanticTokens));
	}

Didn't work :-\ Any idea what I can do to make SemanticHighlightReconcilerStrategy call reconcile(final DirtyRegion dirtyRegion, final IRegion subRegion) ?

Another thing that I noticed is only keyword and variable token types had colours in the Generic editor (I'm trying to do some semantic highlighting in the properties file). All other token types listed in the LSP spec don't have any colour assigned. Is there a way for me to define colours for other token types?

Start by reading the LanguageClientImpl and SemanticHighlightingReconcilerStrategy references in the issue, then compare the workspace/semanticTokens/refresh request with the current Generic editor semantic-token flow. Done would require a defined approach for triggering reconciliation after refresh and assigning colours to additional LSP token types, but the issue does not name implementation files or tests.