data: storing type modifiers in edges

- ASTVisitor uses DataType instead of string to pass on type information.
- Edges can have EdgeComponents.
- EdgeComponentDataType stores information that modifies the type a ...TYPE_OF edge points to.
- EdgeComponentDataType can create a complete DataType using it's internal information.
- Fixed a bug where DataTypeModifiers did not apply their qualifiers.

src/lib/data/graph/Edge.cpp

@@ -2,6 +2,7 @@
 
 #include <sstream>
 
+#include "data/graph/edgeComponent/EdgeComponent.h"
 #include "data/graph/Node.h"
 #include "utility/logging/logging.h"
 
@@ -33,6 +34,11 @@ std::shared_ptr<Edge> Edge::createPlainCopy(Node* from, Node* to) const
 
 	edge->setAccess(m_access);
 
+	for (std::shared_ptr<EdgeComponent> component: m_components)
+	{
+		edge->addComponent(component); // Todo: create a deep copy here
+	}
+
 	return edge;
 }
 
@@ -132,6 +138,12 @@ std::string Edge::getAsString() const
 	return str.str();
 }
 
+void Edge::addComponent(std::shared_ptr<EdgeComponent> component)
+{
+	m_components.push_back(component);
+	component->setEdge(this);
+}
+
 Edge::Edge(Id id, EdgeType type, Node* from, Node* to)
 	: Token(id)
 	, m_type(type)