Removed database status in favor of much cleaner code

Implemented (but deactivated) anti corruption mechanism
WIP detect changes and save them if opening another database

ModernKeePassApp.Test/Mock/DatabaseServiceMock.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Threading.Tasks;
 using ModernKeePass.Interfaces;
 using ModernKeePass.ViewModels;
 using ModernKeePassLib;
@@ -10,6 +11,11 @@ namespace ModernKeePassApp.Test.Mock
 {
     public class DatabaseServiceMock : IDatabase
     {
+        private bool _isOpen;
+        private bool _isFileOpen;
+        private bool _isClosed;
+
+
         public PwCompressionAlgorithm CompressionAlgorithm { get; set; }
 
         public StorageFile DatabaseFile { get; set; }
@@ -18,6 +24,21 @@ namespace ModernKeePassApp.Test.Mock
 
         public KdfParameters KeyDerivation { get; set; }
 
+        public bool IsOpen
+        {
+            get { return _isOpen; }
+        }
+
+        public bool IsFileOpen
+        {
+            get { return _isFileOpen; }
+        }
+
+        public bool IsClosed
+        {
+            get { return _isClosed; }
+        }
+
         public string Name => "MockDatabase";
 
         public GroupVm RecycleBin { get; set; }
@@ -25,17 +46,19 @@ namespace ModernKeePassApp.Test.Mock
         public bool RecycleBinEnabled { get; set; }
 
         public GroupVm RootGroup { get; set; }
-
-        public int Status { get; set; }
-
+        
         public void AddDeletedItem(PwUuid id)
         {
             throw new NotImplementedException();
         }
-
-        public void Close()
+        
+        public Task Close()
         {
-            Status = 0;
+            return Task.Run(() =>
+            {
+                _isClosed = true;
+                _isOpen = false;
+            });
         }
 
         public void CreateRecycleBin()
@@ -43,9 +66,13 @@ namespace ModernKeePassApp.Test.Mock
             throw new NotImplementedException();
         }
 
-        public void Open(CompositeKey key, bool createNew)
+        public Task Open(CompositeKey key, bool createNew)
         {
-            Status = 2;
+            return Task.Run(() =>
+            {
+                _isOpen = true;
+                _isClosed = false;
+            });
         }
 
         public void Save()
@@ -57,7 +84,7 @@ namespace ModernKeePassApp.Test.Mock
         {
             throw new NotImplementedException();
         }
-
+        
         public void UpdateCompositeKey(CompositeKey key)
         {
             throw new NotImplementedException();