(Image) Make Image GetWidth and GetHeight return natural size
(Image) Make Image GetWidth and GetHeight return natural size

[Issue#]  N/A

[Problem] The size of the image should be available at all times

[Cause] N/A

[Solution] Make GetWidth and GetHeight return the natural size

Change-Id: I92f9374b8582c92a356abd62af277cf6b73af86c

pwisbey/dali-core,dalihub/dali-core,dalihub/dali-core,dalihub/dali-core,pwisbey/dali-core,dalihub/dali-core,pwisbey/dali-core,pwisbey/dali-core