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/driver/pictureviewer/bmp.cpp

@@ -1,3 +1,4 @@
+#include <config.h>
 #include "pv_config.h"
 #ifdef FBV_SUPPORT_BMP
 #include "pictureviewer.h"

src/driver/pictureviewer/crw.cpp

@@ -1,3 +1,4 @@
+#include <config.h>
 #include "pv_config.h"
 #include <cstring>
 #include <cstdlib>

src/driver/pictureviewer/gif.cpp

@@ -1,3 +1,4 @@
+#include <config.h>
 #include "pv_config.h"
 
 #include <cstring>

src/driver/pictureviewer/pictureviewer.h

@@ -30,7 +30,7 @@
 #include <vector>
 #include <stdio.h>    /* printf       */
 #include <sys/time.h> /* gettimeofday */
-#include <driver/framebuffer.h>
+#include <inttypes.h>
 class CPictureViewer
 {
 	struct cformathandler 
@@ -64,7 +64,7 @@ class CPictureViewer
 	void Cleanup();
 	void SetVisible(int startx, int endx, int starty, int endy);
 	static double m_aspect_ratio_correction;
-	bool DisplayImage (const std::string & name, int posx, int posy, int width, int height, int transp=CFrameBuffer::TM_EMPTY);
+	bool DisplayImage (const std::string & name, int posx, int posy, int width, int height, int transp=0 /*CFrameBuffer::TM_EMPTY*/);
 // 	bool DisplayLogo (uint64_t channel_id, int posx, int posy, int width, int height);
 	bool GetLogoName(const uint64_t& channel_id, const std::string& ChanName, std::string & name, int *width = NULL, int *height = NULL);
 	fb_pixel_t * getImage (const std::string & name, int width, int height);

src/driver/pictureviewer/png.cpp

@@ -1,3 +1,4 @@
+#include <config.h>
 #include "pv_config.h"
 
 #ifdef FBV_SUPPORT_PNG