Remove references to Sun classes

[IJabz]

From https://java.net/jira/browse/JAUDIOTAGGER-450

1 sun.nio.ch.DirectBuffer : used by org.jaudiotagger.mp3.MP3File, line 252 2 sun.misc.Cleaner : used by org.jaudiotagger.mp3.MP3File, line 252 (through sun.nio.ch.DirectBuffer) - For these 2: why not use java.nio.DirectByteBuffer? Ah, that one also uses sun.misc.Cleaner. darn

3 sun.security.action.GetPropertyAction: used by org.jaudiotagger.logging.LogFormatter, line 25 - I think this can easily be replaced by private final String lineSeparator = String.format("%n");