reduce http timeout to 4s and make it configurable

libeplayer3/include/playback.h

@@ -66,6 +66,9 @@ typedef struct PlaybackHandler_s
 	uint8_t noprobe; /* hack: only minimal probing in av_find_stream_info */
 	uint8_t isLoopMode;
 	uint8_t isTSLiveMode;
+	uint32_t httpTimeout; // in ms
+
+	void *stamp;
 } PlaybackHandler_t;
 
 #endif