account: Adds AccountManager (#2184)

* account: Adds Account Manager

In a way to have Custom User Profiles merged in master faster, this PR adds a `AccountManager` class (based on `AccountUtils` class) and the following changes have been made:
- Adds a "default profile values" which were the old hardcoded ones.
- The image profile is moved to the Account service folder.
- The hardcoded UserId for the savedata is now using the `AccountManager` last opened one.
- The DeviceId in Mii service is changed to the right value (checked by REd sys:set call).

* Fix csproj

* Addresses gdkchan's comments

* Fix UserProfile fields

* Fix mii GetDeviceId()

* Update Ryujinx.HLE.csproj

Ryujinx.HLE/HOS/SystemState/SystemStateMgr.cs

@@ -1,12 +1,9 @@
-using Ryujinx.HLE.HOS.Services.Account.Acc;
 using System;
 
 namespace Ryujinx.HLE.HOS.SystemState
 {
     public class SystemStateMgr
     {
-        public static readonly UserId DefaultUserId = new UserId("00000000000000010000000000000000");
-
         internal static string[] LanguageCodes = new string[]
         {
             "ja",
@@ -46,15 +43,8 @@ namespace Ryujinx.HLE.HOS.SystemState
 
         public bool InstallContents { get; set; }
 
-        public AccountUtils Account { get; private set; }
-
         public SystemStateMgr()
         {
-            Account = new AccountUtils();
-
-            Account.AddUser(DefaultUserId, "Player");
-            Account.OpenUser(DefaultUserId);
-
             // TODO: Let user specify.
             DesiredKeyboardLayout = (long)KeyboardLayout.Default;
         }