build: fixed errors in clang

* removed const m_dimensions in VectorBase and replaced it with N
* changed signature of DummyNode::operator=
* fixed warning for DummyNode wrongly declared as class

src/lib/component/view/graphElements/GraphNode.h

@@ -76,13 +76,14 @@ public:
 		return !(*this < other);
 	}
 
-	void operator=(DummyNode& other)
+	DummyNode& operator=(const DummyNode& other)
 	{
 		name = other.name;
 		tokenId = other.tokenId;
 		position = other.position;
 		subNodes = other.subNodes;
 		actualNode = other.actualNode;
+		return *this;
 	}
 
 	std::string name;