implement keytoken list and all-messages list

flutter/lib/models/keytoken.dart

@@ -2,7 +2,7 @@ class KeyToken {
   final String keytokenID;
   final String name;
   final String timestampCreated;
-  final String? timestampLastused;
+  final String? timestampLastUsed;
   final String ownerUserID;
   final bool allChannels;
   final List<String> channels;
@@ -13,7 +13,7 @@ class KeyToken {
     required this.keytokenID,
     required this.name,
     required this.timestampCreated,
-    required this.timestampLastused,
+    required this.timestampLastUsed,
     required this.ownerUserID,
     required this.allChannels,
     required this.channels,
@@ -26,7 +26,7 @@ class KeyToken {
       keytokenID: json['keytoken_id'] as String,
       name: json['name'] as String,
       timestampCreated: json['timestamp_created'] as String,
-      timestampLastused: json['timestamp_lastused'] as String?,
+      timestampLastUsed: json['timestamp_lastused'] as String?,
       ownerUserID: json['owner_user_id'] as String,
       allChannels: json['all_channels'] as bool,
       channels: (json['channels'] as List<dynamic>).map((e) => e as String).toList(),
@@ -38,6 +38,17 @@ class KeyToken {
   static List<KeyToken> fromJsonArray(List<dynamic> jsonArr) {
     return jsonArr.map<KeyToken>((e) => KeyToken.fromJson(e as Map<String, dynamic>)).toList();
   }
+
+  KeyTokenPreview toPreview() {
+    return KeyTokenPreview(
+      keytokenID: keytokenID,
+      name: name,
+      ownerUserID: ownerUserID,
+      allChannels: allChannels,
+      channels: channels,
+      permissions: permissions,
+    );
+  }
 }
 
 class KeyTokenWithToken {