Fix memory leaks scenario 3 #34
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Fix memory leaks after running scenario 3.
Added necessary destructors, delete all keyframes in timeline destructor, use QVariantList for keyframe list, do not manually allocate the list anymore, create a local list and copy it into QVariantList, a little bit more code but less memory management.
replace all occurrences of constant numbers for
Qt::ItemDataRolewith pre-defines constants.