many many small changes

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

io/teensy/I2SBaseDMA.h

@@ -80,7 +80,9 @@ public:
 	static void clearBuffer() {
 		memset(buffer, 0, sizeof(buffer));
 		state.bufferHalf[0].samplesUsed = 0;
+		state.bufferHalf[0].dropCache();
 		state.bufferHalf[1].samplesUsed = 0;
+		state.bufferHalf[1].dropCache();
 	}
 
 	/** block until the given number of samples were added to the internal buffer */
@@ -99,7 +101,7 @@ public:
 		BufferHalf& bh = state.fillingHalf();
 
 		// determine how many samples to add
-		const uint16_t addable = min(numSamples, bh.samplesFree());
+		const uint16_t addable = std::min(numSamples, bh.samplesFree());
 
 		// actually copy the data
 		uint8_t* dst = (uint8_t*) (&bh.mem[bh.samplesUsed]);