StatusChanged signals are now always emitted.
Other properties only emit when altered.
AnimatedImage local and remote loading was also unified in this fix.
BorderImage duplicated loading code is streamlined.

Task-number: QTBUG-26405
Change-Id: Ib412d5879e0007229a8098e1fa960003051508de
Reviewed-by: Alan Alpert <alan.alpert@nokia.com>