Avoid cut-off symbols in Terminal

On monitors with zoom != 100% on Windows, symbols in the Terminal appear
cut-off. This can be avoided by enabled advanced mode for the GC used
for rendering the text.

Author: HeikoKlare

terminal/bundles/org.eclipse.terminal.control/src/org/eclipse/terminal/internal/textcanvas/GridCanvas.java

@@ -45,6 +45,7 @@ public GridCanvas(Composite parent, int style) {
 	 */
 	@Override
 	protected void paint(GC gc) {
+		gc.setAdvanced(true);
 		Rectangle clipping = gc.getClipping();
 		if (clipping.width == 0 || clipping.height == 0) {
 			return;