many many small changes

switched to the new logging here and there
some cleanups
worked  on i2S
base class for files
id3 parsing

ext/sd/File.h

@@ -0,0 +1,17 @@
+#pragma once
+
+class File {
+	
+public:
+
+	virtual uint32_t size() const = 0;
+
+	virtual uint32_t curPos() const = 0;
+
+	virtual void seekTo(uint32_t pos) = 0;
+	
+	virtual uint32_t read(uint32_t size, uint8_t* dst) = 0;
+
+	virtual uint32_t write(uint32_t size, const uint8_t* src) = 0;
+
+};