ui: bidirectional hovering

hovering for graphview and codeview via messaging, hovering in one view will "hover" the equivalent in the other view

src/lib/component/view/CodeView.h

@@ -43,6 +43,9 @@ public:
 	virtual void showCodeSnippets(const std::vector<CodeSnippetParams>& snippets) = 0;
 	virtual void showCodeFile(const CodeSnippetParams& params) = 0;
 
+	virtual void focusToken(const Id tokenId) = 0;
+	virtual void defocusToken() = 0;
+
 private:
 	CodeController* getController();
 };

src/lib/component/view/GraphView.h

@@ -24,6 +24,8 @@ public:
 	virtual void rebuildGraph(
 		std::shared_ptr<Graph> graph, const std::vector<DummyNode>& nodes, const std::vector<DummyEdge>& edges) = 0;
 	virtual void clear() = 0;
+	virtual void focusToken(Id tokenId) = 0;
+	virtual void defocusToken(Id tokenId) = 0;
 
 	virtual void resizeView() = 0;