base lock timer off of Stopwatch class

src/App/Abstractions/Services/IAppSettingsService.cs

@@ -5,8 +5,6 @@ namespace Bit.App.Abstractions
     public interface IAppSettingsService
     {
         bool Locked { get; set; }
-        string LockTimerId { get; set; }
-        double LastActivityLockTime { get; set; }
         DateTime LastActivity { get; set; }
         DateTime LastCacheClear { get; set; }
         bool AutofillPersistNotification { get; set; }

src/App/Abstractions/Services/ILockService.cs

@@ -10,6 +10,5 @@ namespace Bit.App.Abstractions
         Task<LockType> GetLockTypeAsync(bool forceLock);
         Task CheckLockAsync(bool forceLock);
         bool TopPageIsLock();
-        void StartLockTimer();
     }
 }