CComponents: inherit COSDFader class

Allows a simplified implementation without prior declaration and
initialisation

src/gui/components/cc_base.cpp

@@ -35,7 +35,7 @@
 using namespace std;
 
 //abstract basic class CComponents
-CComponents::CComponents()
+CComponents::CComponents() : COSDFader(g_settings.menu_Content_alpha)
 {
 	x = saved_screen.x 	= 0;
 	y = saved_screen.y 	= 0;

src/gui/components/cc_base.h

@@ -32,13 +32,13 @@
 #include <string>
 #include <driver/pictureviewer/pictureviewer.h>
 #include <gui/widget/icons.h>
-
+#include <driver/fade.h>
 /// Basic component class.
 /*!
 Basic attributes and member functions for component sub classes
 */
 
-class CComponents
+class CComponents : public COSDFader
 {
 	private:
 		///pixel buffer handling, returns pixel buffer depends of given parameters