Case-sensitive support for qti-map-entry

[Julian-91]

Steps to Reproduce:
1. Play a text-entry-interaction item in the player with case-sensitive="false" and a correct answer that contains an uppercase letter.
2. Enter a correct answer without uppercase letters.
3. Have the player evaluate the response.
4. The player incorrectly marks the response as incorrect.

<qti-assessment-item>
  <qti-response-declaration identifier="RESPONSE" cardinality="single" base-type="string">
    <qti-correct-response>
      <qti-value>CorrectAnswer</qti-value>
    </qti-correct-response>
    <qti-mapping default-value="0" case-sensitive="false">
      <qti-map-entry map-key="CorrectAnswer" mapped-value="1"/>
    </qti-mapping>
  </qti-response-declaration>

  <qti-text-entry-interaction response-identifier="RESPONSE"/>
</qti-assessment-item>

Expected Behavior:
The player’s evaluation should accept correctanswer (case-insensitive match).

Actual Behavior:
The player’s evaluation incorrectly marks correctanswer as incorrect.

[Marcelh1983]

Case sensitivity for qti-string-match was already implemented, but there was no support for case sensitivity in qti-map-entry. This functionality has now been added in version 7.0.10.