Add return type to UsersManager methods

Users/User.cs

@@ -19,7 +19,7 @@ namespace Akari.Provider.WaveshareUART.Users
         [YamlIgnore()]
         public int Count => Position - Start;
         [YamlIgnore()]
-        public IEnumerable<int> ValidPositions => Enumerable.Range(Start, Count);
+        public IEnumerable<ushort> ValidPositions => Enumerable.Range(Start, Count).Cast<ushort>();
 
         public User()
         {

Users/UsersManager.cs

@@ -67,22 +67,25 @@ namespace Akari.Provider.WaveshareUART.Users
             Save();
         }
 
-        public void Remove(User user)
+        public bool Remove(User user)
         {
-            _users.Remove(user);
+            if (_users.Remove(user))
+            {
+                Save();
 
-            // TODO Remove fingerprints
+                return true;
+            }
 
-            Save();
+            return false;
         }
 
-        public void Clear()
+        public bool Clear()
         {
             _users.Clear();
 
-            // TODO Remove fingerprints
-
             Save();
+
+            return true;
         }
 
         private void Save()