Add UWP support (#139)

* Add UWP project, and generate services boilerplate

* SqliteService implementation and sqlite-net-pcl update (#bug https://stackoverflow.com/questions/45418669/xamarin-forms-pcl-assemly-issue)

* Important services implementation

* Create a shared project to host images for UWP (to keep code project clean)

* Add extensions to image names referenced by the pcl project

* Add DismissModalToolBarItem to modal pages

* moving UWP folders inside src folder

* Add DeviceInfoService implementation

* Remove dependency on BouncyCastle, and calculate key derivation using native support

* changes requested by project maintener

* Fix HasCamera property

* DeviceActionService implementation

src/UWP/Services/DeviceInfoService.cs

@@ -0,0 +1,43 @@
+using Bit.App.Abstractions;
+using Microsoft.Toolkit.Uwp.Helpers;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Windows.Graphics.Display;
+using Windows.Devices.SmartCards;
+using Windows.Devices.Enumeration;
+
+namespace Bit.UWP.Services
+{
+    public class DeviceInfoService : IDeviceInfoService
+    {
+        public string Model => SystemInformation.DeviceModel;
+
+        public int Version => SystemInformation.OperatingSystemVersion.Build;
+
+        public float Scale => (float)DisplayInformation.GetForCurrentView().RawPixelsPerViewPixel;
+
+        public bool NfcEnabled
+        {
+            get
+            {
+                if (!Windows.Foundation.Metadata.ApiInformation.IsTypePresent("Windows.Devices.SmartCards.SmartCardEmulator"))
+                    return false;
+
+                return Task.Run(async () => await SmartCardEmulator.GetDefaultAsync()).Result != null;
+            }
+        }
+
+        public bool HasCamera
+        {
+            get
+            {
+                var cameraList = Task.Run(async () => await DeviceInformation.FindAllAsync(DeviceClass.VideoCapture)).Result;
+
+                return cameraList?.Any() ?? false;
+            }
+        }
+    }
+}