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

ModernKeePass/Interfaces/IDatabase.cs

@@ -1,4 +1,5 @@
-using Windows.Storage;
+using System.Threading.Tasks;
+using Windows.Storage;
 using ModernKeePass.ViewModels;
 using ModernKeePassLib;
 using ModernKeePassLib.Cryptography.KeyDerivation;
@@ -10,20 +11,23 @@ namespace ModernKeePass.Interfaces
     {
         string Name { get; }
         bool RecycleBinEnabled { get; set; }
-        int Status { get; set; }
+        //int Status { get; set; }
         GroupVm RootGroup { get; set; }
         GroupVm RecycleBin { get; set; }
         StorageFile DatabaseFile { get; set; }
         PwUuid DataCipher { get; set; }
         PwCompressionAlgorithm CompressionAlgorithm { get; set; }
         KdfParameters KeyDerivation { get; set; }
+        bool IsOpen { get; }
+        bool IsFileOpen { get; }
+        bool IsClosed { get; }
 
-        void Open(CompositeKey key, bool createNew);
+        Task Open(CompositeKey key, bool createNew);
         void UpdateCompositeKey(CompositeKey key);
         void Save();
         void Save(StorageFile file);
         void CreateRecycleBin();
         void AddDeletedItem(PwUuid id);
-        void Close();
+        Task Close();
     }
 }