Refactoring of acc:u0 (#701)

* Refactoring of acc:u0

- Move all account things to the account service
- More accurate IAccountServiceForApplication
- Add helper to UInt128

* FIx my engrish

* FIx my engrish #2

Ryujinx.HLE/HOS/Services/Acc/Account/UserProfile.cs

@@ -0,0 +1,37 @@
+using Ryujinx.HLE.Utilities;
+using System;
+
+namespace Ryujinx.HLE.HOS.SystemState
+{
+    class UserProfile
+    {
+        private static readonly DateTime Epoch = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc);
+
+        public UInt128 UserId { get; private set; }
+
+        public string Name { get; private set; }
+
+        public long LastModifiedTimestamp { get; private set; }
+
+        public AccountState AccountState    { get; set; }
+        public AccountState OnlinePlayState { get; set; }
+
+        public UserProfile(UInt128 userId, string name)
+        {
+            UserId = userId;
+            Name   = name;
+
+            LastModifiedTimestamp = 0;
+
+            AccountState    = AccountState.Closed;
+            OnlinePlayState = AccountState.Closed;
+
+            UpdateTimestamp();
+        }
+
+        private void UpdateTimestamp()
+        {
+            LastModifiedTimestamp = (long)(DateTime.Now - Epoch).TotalSeconds;
+        }
+    }
+}