Extend ImageDataAtSizeProvider to cropped image rendering

[HeikoKlare]

The ImageDataAtSizeProvider was introduced with:

• GC#DrawImage(image, destX, destY, destWidth, destHeight) now tries to load images at the requested destination size before drawing eclipse-platform/eclipse.platform.swt#2526

It is currently limited to drawing an image with GC#drawImage(image, x, y, width, height). It would also be useful to be considered in the longer existing GC#drawImage(image, srcX, srcY, srcWidth, srxHeight, destX, destY, destWidth, destHeight) method for drawing cropped images.

It shall be validated if the ImageDataAtSizeProvider can be adopted with reasonable effort in that method as well. Preliminary work that can be extended for prototyping has been started here:

• Support rendering images at custom sizes eclipse-platform/eclipse.platform.swt#2487