Added getProperty() method to ctkPluginContext()

Using this method it is possible to retrieve framework
properties which might have been set when the plugin
framework was initialized.

Libs/PluginFramework/ctkPluginContext.cpp

@@ -58,6 +58,13 @@ ctkPluginContext::~ctkPluginContext()
   delete d;
 }
 
+QVariant ctkPluginContext::getProperty(const QString& key) const
+{
+  Q_D(const ctkPluginContext);
+  d->isPluginContextValid();
+  return d->plugin->fwCtx->props.value(key);
+}
+
 ctkPlugin* ctkPluginContext::getPlugin() const
 {
   Q_D(const ctkPluginContext);

Libs/PluginFramework/ctkPluginContext.h

@@ -100,6 +100,17 @@
     ~ctkPluginContext();
 
     /**
+     * Returns the value of the specified property. If the key is not found in
+     * the Framework properties, the system properties are then searched. The
+     * method returns an invalid QVariant if the property is not found.
+     *
+     * @param key The name of the requested property.
+     * @return The value of the requested property, or an invalid QVariant if
+     *         the property is undefined.
+     */
+    QVariant getProperty(const QString& key) const;
+
+    /**
      * Returns the <code>ctkPlugin</code> object associated with this
      * <code>ctkPluginContext</code>. This plugin is called the context plugin.
      *