Feature #33: Enhanced Device Importing

Dynamic device importing. better input parsing and 5 additional import
fields.

Disco.Services/Devices/Importing/IDeviceImportCache.cs

@@ -0,0 +1,15 @@
+using Disco.Models.Repository;
+using System.Collections.Generic;
+
+namespace Disco.Services.Devices.Importing
+{
+    internal interface IDeviceImportCache
+    {
+        Device FindDevice(string DeviceSerialNumber);
+
+        IEnumerable<Device> Devices { get; }
+        IEnumerable<DeviceModel> DeviceModels { get; }
+        IEnumerable<DeviceProfile> DeviceProfiles { get; }
+        IEnumerable<DeviceBatch> DeviceBatches { get; }
+    }
+}