Add visibility to property cache
Add visibility to property cache

Added QmcUnitPropertyCacheCreator as a friend for property cache.

qmlc/qtdeclarative,qmlc/qtdeclarative,qmlc/qtdeclarative,qmlc/qtdeclarative,qmlc/qtdeclarative,qmlc/qtdeclarative,qmlc/qtdeclarative,qmlc/qtdeclarative