Add very basic Stream Management (XEP-0198) support

This implementation only counts incomming stanzas and
sends ACKs on request.
While basic this already allows servers to write
messages to offline storage that were sent to,
but never received by a client.

tests/test.m

@@ -32,6 +32,7 @@
 #import "XMPPMessage.h"
 #import "XMPPPresence.h"
 #import "XMPPRoster.h"
+#import "XMPPStreamManagement.h"
 #import "XMPPJSONFileStorage.h"
 
 @interface AppDelegate: OFObject
@@ -104,6 +105,8 @@ OF_APPLICATION_DELEGATE(AppDelegate)
 	roster = [[XMPPRoster alloc] initWithConnection: conn];
 	[roster addDelegate: self];
 
+	[[XMPPStreamManagement alloc] initWithConnection: conn];
+
 	if ([arguments count] != 3) {
 		of_log(@"Invalid count of command line arguments!");
 		[OFApplication terminateWithStatus: 1];
@@ -139,10 +142,11 @@ OF_APPLICATION_DELEGATE(AppDelegate)
 	of_log(@"Auth successful");
 }
 
-- (void)connection: (XMPPConnection*)conn
+- (void)connection: (XMPPConnection*)conn_
      wasBoundToJID: (XMPPJID*)jid
 {
 	of_log(@"Bound to JID: %@", [jid fullJID]);
+	of_log(@"Supports SM: %@", [conn_ supportsStreamManagement] ? @"YES" : @"NO");
 
 	[roster requestRoster];
 }