[C++] Drop JoynrMessageSerializer::removeEscapeFromSpecialChars
[C++] Drop JoynrMessageSerializer::removeEscapeFromSpecialChars

Use the same function in Util.h instead.

Change-Id: I7fd11ccb288fc3cde883907abc1a3580149ff180

bmwcarit/joynr,bmwcarit/joynr,bmwcarit/joynr,clive-jevons/joynr,clive-jevons/joynr,bmwcarit/joynr,bmwcarit/joynr,bmwcarit/joynr,clive-jevons/joynr,clive-jevons/joynr,clive-jevons/joynr,bmwcarit/joynr,bmwcarit/joynr,bmwcarit/joynr,clive-jevons/joynr