Create and add SVG variants for Match/Alignment icons

This contributes following SVG icons:
- matchsize.svg
- matchwidth.svg
- matchheight.svg
- alignbottom.svg
- aligncenter.svg
- alignleft.svg
- alignmid.svg
- alignright.svg
- aligntop.svg

Note: Because newer versions of SWT are able to automatically generate
the "disabled", no SVGs are created for those.

Contributes to eclipse-gef#732

Author: ptziegler

org.eclipse.gef/src/org/eclipse/gef/internal/InternalImages.java

@@ -102,20 +102,20 @@ public class InternalImages {
 		DESC_ZOOM_IN = createDescriptor("icons/zoom_in.svg"); //$NON-NLS-1$
 		DESC_ZOOM_OUT = createDescriptor("icons/zoom_out.svg"); //$NON-NLS-1$
 
-		DESC_MATCH_SIZE = createDescriptor("icons/matchsize.png"); //$NON-NLS-1$
-		DESC_MATCH_WIDTH = createDescriptor("icons/matchwidth.png"); //$NON-NLS-1$
-		DESC_MATCH_HEIGHT = createDescriptor("icons/matchheight.png"); //$NON-NLS-1$
+		DESC_MATCH_SIZE = createDescriptor("icons/matchsize.svg"); //$NON-NLS-1$
+		DESC_MATCH_WIDTH = createDescriptor("icons/matchwidth.svg"); //$NON-NLS-1$
+		DESC_MATCH_HEIGHT = createDescriptor("icons/matchheight.svg"); //$NON-NLS-1$
 
 		DESC_MATCH_SIZE_DIS = createDescriptor("icons/matchsize_d.png"); //$NON-NLS-1$
 		DESC_MATCH_WIDTH_DIS = createDescriptor("icons/matchwidth_d.png"); //$NON-NLS-1$
 		DESC_MATCH_HEIGHT_DIS = createDescriptor("icons/matchheight_d.png"); //$NON-NLS-1$
 
-		DESC_VERT_ALIGN_BOTTOM = createDescriptor("icons/alignbottom.png"); //$NON-NLS-1$
-		DESC_HORZ_ALIGN_CENTER = createDescriptor("icons/aligncenter.png"); //$NON-NLS-1$
-		DESC_HORZ_ALIGN_LEFT = createDescriptor("icons/alignleft.png"); //$NON-NLS-1$
-		DESC_VERT_ALIGN_MIDDLE = createDescriptor("icons/alignmid.png"); //$NON-NLS-1$
-		DESC_HORZ_ALIGN_RIGHT = createDescriptor("icons/alignright.png"); //$NON-NLS-1$
-		DESC_VERT_ALIGN_TOP = createDescriptor("icons/aligntop.png"); //$NON-NLS-1$
+		DESC_VERT_ALIGN_BOTTOM = createDescriptor("icons/alignbottom.svg"); //$NON-NLS-1$
+		DESC_HORZ_ALIGN_CENTER = createDescriptor("icons/aligncenter.svg"); //$NON-NLS-1$
+		DESC_HORZ_ALIGN_LEFT = createDescriptor("icons/alignleft.svg"); //$NON-NLS-1$
+		DESC_VERT_ALIGN_MIDDLE = createDescriptor("icons/alignmid.svg"); //$NON-NLS-1$
+		DESC_HORZ_ALIGN_RIGHT = createDescriptor("icons/alignright.svg"); //$NON-NLS-1$
+		DESC_VERT_ALIGN_TOP = createDescriptor("icons/aligntop.svg"); //$NON-NLS-1$
 
 		DESC_VERT_ALIGN_BOTTOM_DIS = createDescriptor("icons/alignbottom_d.png"); //$NON-NLS-1$
 		DESC_HORZ_ALIGN_CENTER_DIS = createDescriptor("icons/aligncenter_d.png"); //$NON-NLS-1$