Multi zoom level support of GC for win32

This commit contributes to multi zoom level support of GC which can be extended by other resources and widgets.

Contributes to
#62 and #131

bundles/org.eclipse.swt/Eclipse SWT Drag and Drop/win32/org/eclipse/swt/dnd/DragSource.java

@@ -491,7 +491,7 @@ private void drag(Event dragEvent) {
 	hwndDrag = 0;
 	topControl = null;
 	if (image != null) {
-		imagelist = new ImageList(SWT.NONE);
+		imagelist = new ImageList(SWT.NONE, DPIUtil.getZoomForAutoscaleProperty(nativeZoom));
 		imagelist.add(image);
 		topControl = control.getShell();
 		/*

bundles/org.eclipse.swt/Eclipse SWT/win32/org/eclipse/swt/graphics/Cursor.java

@@ -15,6 +15,7 @@
 
 
 import org.eclipse.swt.*;
+import org.eclipse.swt.internal.*;
 import org.eclipse.swt.internal.win32.*;
 
 /**
@@ -300,7 +301,7 @@ public Cursor(Device device, ImageData source, int hotspotX, int hotspotY) {
 		if (hMask == 0) SWT.error(SWT.ERROR_NO_HANDLES);
 	} else {
 		ImageData mask = source.getTransparencyMask();
-		long [] result = Image.init(this.device, null, source, mask);
+		long [] result = Image.init(this.device, null, source, mask, DPIUtil.getDeviceZoom());
 		hBitmap = result[0];
 		hMask = result[1];
 	}

bundles/org.eclipse.swt/Eclipse SWT/win32/org/eclipse/swt/graphics/GCData.java

@@ -47,6 +47,7 @@ public final class GCData {
 	public float[] lineDashes;
 	public float lineMiterLimit = 10;
 	public int alpha = 0xFF;
+	public int nativeDeviceZoom;
 
 	public Image image;
 	public PAINTSTRUCT ps;