Forum Sharing Client backend

This commit replaces the old ForumSharingManagerImpl with a new one
which is based on state machines and the ProtocolEngine.

There is a SharerEngine and a InviteeEngine that take care of state
transitions, messages, events and trigger actions to be carried out by
the ForumSharingManagerImpl. This is all very similar to the
Introduction Client.

The general sharing paradigm has been changed from sharing as a state to
sharing as an action. Now the UI can allow users to invite contacts to
forums. The contacts can accept or decline the invitiation. Also, the
Forum Sharing Manger is notified when users leave a forum.

Closes #322

briar-api/src/org/briarproject/api/messaging/PrivateMessageHeader.java

@@ -2,50 +2,19 @@ package org.briarproject.api.messaging;
 
 import org.briarproject.api.sync.MessageId;
 
-public class PrivateMessageHeader {
+public class PrivateMessageHeader extends BaseMessage {
 
-	private final MessageId id;
-	private final long timestamp;
 	private final String contentType;
-	private final boolean local, read, sent, seen;
 
 	public PrivateMessageHeader(MessageId id, long timestamp,
 			String contentType, boolean local, boolean read, boolean sent,
 			boolean seen) {
-		this.id = id;
-		this.timestamp = timestamp;
-		this.contentType = contentType;
-		this.local = local;
-		this.read = read;
-		this.sent = sent;
-		this.seen = seen;
-	}
 
-	public MessageId getId() {
-		return id;
+		super(id, timestamp, local, read, sent, seen);
+		this.contentType = contentType;
 	}
 
 	public String getContentType() {
 		return contentType;
 	}
-
-	public long getTimestamp() {
-		return timestamp;
-	}
-
-	public boolean isLocal() {
-		return local;
-	}
-
-	public boolean isRead() {
-		return read;
-	}
-
-	public boolean isSent() {
-		return sent;
-	}
-
-	public boolean isSeen() {
-		return seen;
-	}
 }