Remove redundant label for Button Properties

Label is now hidden by default for Button Properties which saves space
for long button descriptions

application/gui/properties/abstractpropertywidget.cpp

@@ -67,6 +67,11 @@ namespace campvis {
         _property->s_changed.disconnect(this);
     }
 
+    void AbstractPropertyWidget::setLabelVisibile(bool isVisible) {
+        if (_titleLabel)
+            _titleLabel->setVisible(isVisible);
+    }
+
     void AbstractPropertyWidget::addWidget(QWidget* widget, int stretch) {
         _layout->addWidget(widget, stretch);
     }

application/gui/properties/abstractpropertywidget.h

@@ -59,6 +59,13 @@ namespace campvis {
          */
         virtual ~AbstractPropertyWidget();
 
+        /**
+         * Shows or hides the label that appears on the left hand side of the widget.
+         *
+         * \param   isVisible       Wether the label should be shown or not
+         */
+        void setLabelVisibile(bool isVisible);
+
     protected:
         /**
          * Adds a widget to the local Qt layout.

application/gui/properties/buttonpropertywidget.cpp

@@ -31,6 +31,8 @@ namespace campvis {
         : AbstractPropertyWidget(property, false, dataContainer, parent)
         , _button(0)
     {
+        setLabelVisibile(false);
+
         _button = new QPushButton(QString::fromStdString(property->getTitle()), this);
         connect(_button, SIGNAL(clicked(bool)), this, SLOT(onButtonClicked(bool)));
         addWidget(_button);