More refactoring

Added first simple unit test

src/Kp2aUnitTests/TestKp2aApp.cs

@@ -0,0 +1,54 @@
+using System;
+using Android.Content;
+using KeePassLib.Serialization;
+using keepass2android;
+
+namespace Kp2aUnitTests
+{
+	/// <summary>
+	/// Very simple implementation of the Kp2aApp interface to be used in tests
+	/// </summary>
+	internal class TestKp2aApp : IKp2aApp
+	{
+		private Database _db;
+
+		public void SetShutdown()
+		{
+			
+		}
+
+		public Database GetDb()
+		{
+			return _db;
+		}
+
+		public void StoreOpenedFileAsRecent(IOConnectionInfo ioc, string keyfile)
+		{
+			
+		}
+
+		public Database CreateNewDatabase()
+		{
+			TestDrawableFactory testDrawableFactory = new TestDrawableFactory();
+			_db = new Database(testDrawableFactory, new TestKp2aApp());
+			return _db;
+
+		}
+
+		public string GetResourceString(UiStringKey stringKey)
+		{
+			return stringKey.ToString();
+		}
+
+		public bool GetBooleanPreference(PreferenceKey key)
+		{
+			return true;
+		}
+
+		public void AskYesNoCancel(UiStringKey titleKey, UiStringKey messageKey, EventHandler<DialogClickEventArgs> yesHandler, EventHandler<DialogClickEventArgs> noHandler,
+		                           EventHandler<DialogClickEventArgs> cancelHandler, Context ctx)
+		{
+			yesHandler(null, null);
+		}
+	}
+}