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/TokenLocation.h

@@ -0,0 +1,57 @@
+#ifndef TOKEN_LOCATION_H
+#define TOKEN_LOCATION_H
+
+#include <memory>
+#include <ostream>
+#include <string>
+
+#include "utility/types.h"
+
+class Token;
+class TokenLocationFile;
+class TokenLocationLine;
+
+class TokenLocation
+{
+public:
+	TokenLocation(Id tokenId, TokenLocationLine* line, unsigned int columnNumber, bool isStart);
+	TokenLocation(Id id, Id tokenId, TokenLocationLine* line, unsigned int columnNumber, bool isStart);
+	~TokenLocation();
+
+	Id getId() const;
+	Id getTokenId() const;
+
+	TokenLocationLine* getTokenLocationLine() const;
+	TokenLocationFile* getTokenLocationFile() const;
+
+	unsigned int getColumnNumber() const;
+	unsigned int getLineNumber() const;
+	const std::string& getFilePath() const;
+
+	TokenLocation* getOtherTokenLocation() const;
+	void setOtherTokenLocation(TokenLocation* location);
+
+	TokenLocation* getStartTokenLocation();
+	TokenLocation* getEndTokenLocation();
+
+	bool isStartTokenLocation() const;
+	bool isEndTokenLocation() const;
+
+	std::shared_ptr<TokenLocation> createPlainCopy(TokenLocationLine* line) const;
+
+private:
+	static Id s_locationId;
+
+	const Id m_id;
+	const Id m_tokenId;
+
+	TokenLocationLine* const m_line;
+	const unsigned int m_columnNumber;
+
+	TokenLocation* m_other;
+	const bool m_isStart;
+};
+
+std::ostream& operator<<(std::ostream& ostream, const TokenLocation& location);
+
+#endif // TOKEN_LOCATION_H