Initial implementation of glabels-batch.

Note: must currently use QGuiApplication instead of QCoreApplication to
support QFont.  Unfortunately, this means that glabels-batch must run
within a windowing system.  Ideally, it would not have this requirement.

glabels/TemplatePicker.cpp

@@ -38,7 +38,7 @@ namespace glabels
 		setSpacing( 24 );
 		setWordWrap( true );
 		setUniformItemSizes( true );
-		setIconSize( QSize(TEMPLATE_PREVIEW_SIZE, TEMPLATE_PREVIEW_SIZE) );
+		setIconSize( QSize(TemplatePickerItem::SIZE, TemplatePickerItem::SIZE) );
 	}