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/location/TokenLocationCollection.h

@@ -0,0 +1,51 @@
+#ifndef TOKEN_LOCATION_COLLECTION_H
+#define TOKEN_LOCATION_COLLECTION_H
+
+#include <map>
+#include <memory>
+#include <ostream>
+#include <string>
+
+#include "utility/types.h"
+
+class TokenLocation;
+class TokenLocationFile;
+
+class TokenLocationCollection
+{
+public:
+	typedef std::map<std::string, std::shared_ptr<TokenLocationFile> > TokenLocationFileMapType;
+	typedef std::pair<std::string, std::shared_ptr<TokenLocationFile> > TokenLocationFilePairType;
+
+	TokenLocationCollection();
+	~TokenLocationCollection();
+
+	const TokenLocationFileMapType& getTokenLocationFiles() const;
+	size_t getTokenLocationFileCount() const;
+
+	const std::map<Id, TokenLocation*>& getTokenLocations() const;
+	size_t getTokenLocationCount() const;
+
+	TokenLocation* addTokenLocation(
+		Id tokenId, const std::string& filePath,
+		unsigned int startLineNumber, unsigned int startColumnNumber,
+		unsigned int endLineNumber, unsigned int endColumnNumber);
+	void removeTokenLocation(TokenLocation* location);
+
+	TokenLocation* findTokenLocationById(Id id) const;
+	TokenLocationFile* findTokenLocationFileByPath(const std::string& filePath) const;
+
+	void forEachTokenLocationFile(std::function<void(TokenLocationFile*)> func) const;
+
+	TokenLocation* addTokenLocationAsPlainCopy(const TokenLocation* location);
+
+private:
+	TokenLocationFile* createTokenLocationFile(const std::string& filePath);
+
+	TokenLocationFileMapType m_files;
+	std::map<Id, TokenLocation*> m_locations;
+};
+
+std::ostream& operator<<(std::ostream& ostream, const TokenLocationCollection& base);
+
+#endif // TOKEN_LOCATION_COLLECTION_H