Update precompiled pdfium for mac to chromium/3071 and add version info file with minimal build instructions

custom_widgets/yacreader_spin_slider_widget.h

@@ -0,0 +1,35 @@
+#ifndef YACREADER_SPIN_SLIDER_WIDGET_H
+#define YACREADER_SPIN_SLIDER_WIDGET_H
+
+#include <QWidget>
+
+class QLabel;
+class QSpinBox;
+class QSlider;
+
+class YACReaderSpinSliderWidget : public QWidget
+{
+	Q_OBJECT
+private:
+	QLabel * label;
+	QSpinBox * spinBox;
+	QSlider * slider;
+	bool tracking;
+public:
+	YACReaderSpinSliderWidget(QWidget * parent = 0,bool strechableSlider = false);
+public slots:
+	void setRange(int lowValue, int topValue, int step=1);
+	void setValue(int value);
+	void setText(const QString & text);
+	int getValue();
+	QSize minimumSizeHint() const;
+	void setTracking(bool b);
+	void valueWillChange(int);
+	void valueWillChangeFromSpinBox(int);
+	void sliderRelease();
+signals:
+	void valueChanged(int);
+
+};
+
+#endif // YACREADER_SPIN_SLIDER_WIDGET_H