data: Saving TokenLocations in Storage

This change adds structures for saving TokenLocations in the Storage and improves the location derival in the
ASTVisitor:
* TokenLocation saves an Id of a Token. For each Token two TokenLocations are created for both start- and endpoint. They
  keep a reference to each other and know whether they are start or end.
* TokenLocationLine saves all TokenLocations in a line and the lineNumber.
* TokenLocationFile saves all TokenLocationLines of a specific file and the filePath.
* TokenLocationCollection saves multiple TokenLocationFiles.
* TokenLocation can derive it's lineNumber and filePath through references to first TokenLocationLine and from there to
  TokenLocationFile.

src/lib/data/graph/Token.cpp

@@ -1,5 +1,8 @@
 #include "data/graph/Token.h"
 
+#include "data/location/TokenLocation.h"
+#include "utility/logging/logging.h"
+
 Token::Token()
 	: m_id(s_nextId++)
 {
@@ -14,9 +17,33 @@ Id Token::getId() const
 	return m_id;
 }
 
-Id Token::s_nextId = 1;
+const std::vector<Id>& Token::getLocationIds() const
+{
+	return m_locationIds;
+}
+
+void Token::addLocationId(Id locationId)
+{
+	m_locationIds.push_back(locationId);
+}
+
+void Token::removeLocationId(Id locationId)
+{
+	for (std::vector<Id>::const_iterator it = m_locationIds.begin(); it != m_locationIds.end(); it++)
+	{
+		if (*it == locationId)
+		{
+			m_locationIds.erase(it);
+			return;
+		}
+	}
+
+	LOG_ERROR("Location Id was not referenced by this Token.");
+}
 
 Token::Token(Id id)
 	: m_id(id)
 {
 }
+
+Id Token::s_nextId = 1;