Added some parts of ctk lib.

As it looks now that lib contains way more then I want to pull in so i'm just copying the files i'm interested in.

ctk/ctkWidgetsUtils.h

@@ -0,0 +1,53 @@
+/*=========================================================================
+
+  Library:   CTK
+
+  Copyright (c) Kitware Inc.
+
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+
+      http://www.apache.org/licenses/LICENSE-2.0.txt
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+
+=========================================================================*/
+
+#ifndef __ctkWidgetsUtils_h
+#define __ctkWidgetsUtils_h
+
+// Qt includes
+#include <QString>
+#include <QRect>
+class QImage;
+
+#include "ctkWidgetsExport.h"
+
+namespace ctk {
+///
+/// \ingroup Widgets
+/// Create a base 64 image tag. Can be used that way:
+/// QString("<img src=\"%1\">").arg(base64HTMLImageTagSrc(myImage);
+QString CTK_WIDGETS_EXPORT base64HTMLImageTagSrc(const QImage& image);
+
+///
+/// \ingroup Widgets
+/// Grab the contents of a QWidget and all its children.
+/// Handle correctly the case of QGLWidgets.
+/// \sa QWidget::grab
+QImage CTK_WIDGETS_EXPORT grabWidget(QWidget* widget, QRect rectangle = QRect());
+
+///
+/// \ingroup Widgets
+/// Convert an KWidget encoded image into a QImage
+/// The data can be base64 encoded and/or zlib compressed.
+QImage CTK_WIDGETS_EXPORT kwIconToQImage(const unsigned char *data, int width, int height, int pixelSize, unsigned int bufferLength, int options = 0);
+
+}
+
+#endif