Moved tag definitions inside serial component.

components/net/sf/briar/serial/ReaderImpl.java

@@ -13,7 +13,6 @@ import net.sf.briar.api.FormatException;
 import net.sf.briar.api.serial.Consumer;
 import net.sf.briar.api.serial.ObjectReader;
 import net.sf.briar.api.serial.Reader;
-import net.sf.briar.api.serial.Tag;
 
 class ReaderImpl implements Reader {
 

api/net/sf/briar/api/serial/Tag.java → components/net/sf/briar/serial/Tag.java

-package net.sf.briar.api.serial;
+package net.sf.briar.serial;
 
-public interface Tag {
+interface Tag {
 
 	static final byte FALSE = -1; // 1111 1111
 	static final byte TRUE = -2; // 1111 1110

components/net/sf/briar/serial/WriterImpl.java

@@ -8,7 +8,6 @@ import java.util.Map;
 import java.util.Map.Entry;
 
 import net.sf.briar.api.Bytes;
-import net.sf.briar.api.serial.Tag;
 import net.sf.briar.api.serial.Writable;
 import net.sf.briar.api.serial.Writer;