replace framebuffer.h include with forward declaration

instead of including framebuffer.h almost everywhere, replace it with
class CFrameBuffer forward declarations and/or generic system includes.
Add a hack to define fb_pixel_t to config.h (one reason for
framebuffer.h includes was the fb_pixel_t define)


Origin commit data
------------------
Commit: e490f84ea8
Author: Stefan Seyfried <seife@tuxbox-git.slipkontur.de>
Date: 2017-02-05 (Sun, 05 Feb 2017)

src/gui/components/cc_draw.h

@@ -29,6 +29,7 @@
 #include "cc_signals.h"
 #include "cc_timer.h"
 #include <driver/colorgradient.h>
+#include <driver/framebuffer.h>
 #include <driver/fade.h>
 #include <gui/color.h>
 

src/gui/components/cc_types.h

@@ -26,12 +26,12 @@
 #ifndef __CC_TYPES__
 #define __CC_TYPES__
 
-#include <driver/framebuffer.h>
 #include <system/localize.h>
 #include <driver/fontrenderer.h>
 #include <driver/rcinput.h>
 #include <gui/color_custom.h>
 
+struct gradientData_t;
 class CComponentsForm;
 class CComponentsScrollBar;