logic: don't show implicit or undefined child nodes in graph unless connected

* visit implicit declarations in ASTVisitor
* show implicit and undefined child nodes only when connected
* fixed some bundle edges couldn't be split
* add "implicit" to tooltip
* show undefiend and implicit nodes hatched

src/lib_gui/qt/view/graphElements/QtGraphEdge.cpp

@@ -176,7 +176,9 @@ void QtGraphEdge::onClick()
 {
 	if (!getData())
 	{
-		MessageGraphNodeBundleSplit(m_target.lock()->getTokenId()).dispatch();
+		std::weak_ptr<QtGraphNode> node =
+			(m_direction == TokenComponentAggregation::DIRECTION_BACKWARD ? m_owner : m_target);
+		MessageGraphNodeBundleSplit(node.lock()->getTokenId()).dispatch();
 	}
 	else
 	{