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)

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>