Support for updated accounts API

Implemented Notification Service Extension

NotificationService/Data.swift

@@ -0,0 +1,31 @@
+import Foundation
+
+enum Namespaces {
+    struct Peer {
+        static let CloudUser: PeerId.Namespace = 0
+        static let CloudGroup: PeerId.Namespace = 1
+        static let CloudChannel: PeerId.Namespace = 2
+    }
+}
+
+struct PeerId {
+    typealias Namespace = Int32
+    typealias Id = Int32
+    
+    public let namespace: Namespace
+    public let id: Id
+    
+    public init(namespace: Namespace, id: Id) {
+        self.namespace = namespace
+        self.id = id
+    }
+    
+    public init(_ n: Int64) {
+        self.namespace = Int32((n >> 32) & 0x7fffffff)
+        self.id = Int32(bitPattern: UInt32(n & 0xffffffff))
+    }
+    
+    public func toInt64() -> Int64 {
+        return (Int64(self.namespace) << 32) | Int64(bitPattern: UInt64(UInt32(bitPattern: self.id)))
+    }
+}