Replace usages of new Image(device, width, height) / new GC(image)

[HeikoKlare]

As documented in #171, images instantiated with a fixed width/height, which are usually used as a canvas to manually draw an, are insufficient for multi-zoom scenarios, in which an image to be drawn on demand may be required in different sizes.

In #143, a new constructor for Image, taking an ImageGcDrawer, has been introduced to replace the implementation in above mentioned use cases with a dynamic generation of an image at the propert size.

This is a follow-up task consisting of the following steps:

• Replace all calls to new Image(device, width, height) with a subsequent call to new GC(image) with a proper ImageGcDrawer
• Reprecate the Image constructor taking a device, width, and height.

[HeikoKlare]

Can you please check whether this is a reasonable task, @akoch-yatta?

[ShahzaibIbrahim]

Attaching file to categorize the usages in order to separately deal with the changes. First priority being replacing in Platform/SWT

UsageForImageConstructor.xlsx

[fedejeanne]

@ShahzaibIbrahim please address this comment too: eclipse-platform/eclipse.platform.ui#2869 (comment)

Keep in mind that SimpleImageDescriptor is a private class that is only being used in tests so it might be even worth to delete it and use its sibling class: ComplexImageDescriptor (or maybe even other subclass of AbstractImageDescriptor).