data: increased parse and graph assembly performance

* removed header search in subdirectories of header search paths
* cache file node ids in Storage for faster lookup
* retrieve node names from SearchIndex
* fixed addNodeAndAllChildren also called for member edges
* added check if node already present in addEdgeAndAllChildren

src/lib/data/graph/Node.cpp

@@ -11,6 +11,8 @@
 #include "data/graph/token_component/TokenComponentSignature.h"
 #include "data/graph/token_component/TokenComponentFilePath.h"
 
+const Node::NodeTypeMask Node::NODE_NOT_VISIBLE = Node::NODE_UNDEFINED | Node::NODE_NAMESPACE;
+
 std::string Node::getTypeString(NodeType type)
 {
 	switch (type)