Implement continuous tape labels and path-based label shapes.

- Added "roll" as a special paper id
- Added roll_width attribute to draw tape in previews
- Updated Brother QL-500/* label templates
- Preserve print dialog settings between print jobs.
- Added path based labels for arbitrary shaped labels.
- Fleshed out implementation of continuous labels.

glabels/RollTemplatePath.h

@@ -0,0 +1,49 @@
+/*  RollTemplatePath.h
+ *
+ *  Copyright (C) 2018  Jim Evins <evins@snaught.com>
+ *
+ *  This file is part of gLabels-qt.
+ *
+ *  gLabels-qt is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  gLabels-qt is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with gLabels-qt.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef RollTemplatePath_h
+#define RollTemplatePath_h
+
+
+#include "model/Template.h"
+#include <QPainterPath>
+
+
+namespace glabels
+{
+	
+	///
+	/// Painter path for "Roll" templates
+	///
+	class RollTemplatePath : public QPainterPath
+	{
+
+		/////////////////////////////////
+		// Life Cycle
+		/////////////////////////////////
+	public:
+		RollTemplatePath( const model::Template* tmplate );
+
+	};
+
+}
+
+
+#endif // RollTemplatePath_h