test: added StorageTestSuite

This change adds the StorageTestSuite that checks whether the ParserClient callbacks cause the right things to be saved.
In order to allow for easier data retrieval the ParserClient callbacks now return the Id of the inserted Token, which
can then be used to retrieve the Token pointer.

src/test/TextAccessTestSuite.h

@@ -1,8 +1,5 @@
 #include "cxxtest/TestSuite.h"
 
-#include <memory>
-#include <string>
-
 #include "utility/text/TextAccess.h"
 
 class TextAccessTestSuite : public CxxTest::TestSuite