CorrectWriting Auto-feedback question implementation

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Goal

This question type goal was to simplify report of student mistakes in a shortanswer question, when student is learning programming language or in simple cases of natural language learning, when student must write correct expression, and we should give him information about skipping some words or placing words in incorrect order. This also could be useful, when we don't give actual information about what words (or some kinds of symbols) was moved or absent in answer, but their meaning, thus forcing student to know what does this part of symbol means.