Refactor RaspberryPi port

drivers/Linux/Stream.h

@@ -0,0 +1,15 @@
+#ifndef Stream_h
+#define Stream_h
+
+class Stream {
+	public:
+		virtual size_t write(uint8_t) = 0;
+		virtual size_t write(const uint8_t *buffer, size_t size) = 0;
+
+		virtual int available() = 0;
+		virtual int read() = 0;
+		virtual int peek() = 0;
+		virtual void flush() = 0;
+};
+
+#endif