Feature: MS Excel (xlsx) Import/Export

Microsoft Excel files can be used to import/export devices. Several
import bugs were also fixed in the process.

Disco.Models/Services/Devices/Exporting/DeviceExportFieldMetadata.cs

@@ -0,0 +1,21 @@
+using System;
+
+namespace Disco.Models.Services.Devices.Exporting
+{
+    public class DeviceExportFieldMetadata
+    {
+        public string Name { get; set; }
+        public string ColumnName { get; set; }
+        public Type ValueType { get; set; }
+        public Func<DeviceExportRecord, object> Accessor { get; set; }
+        public Func<object, string> CsvEncoder { get; set; }
+
+        public DeviceExportFieldMetadata(string Name, Type ValueType, Func<DeviceExportRecord, object> Accessor, Func<object, string> CsvEncoder)
+        {
+            this.Name = Name;
+            this.ValueType = ValueType;
+            this.Accessor = Accessor;
+            this.CsvEncoder = CsvEncoder;
+        }
+    }
+}

Disco.Models/Services/Devices/Exporting/DeviceExportOptions.cs

@@ -12,10 +12,7 @@ namespace Disco.Models.Services.Devices.Exporting
         public DeviceExportTypes ExportType { get; set; }
         public int? ExportTypeTargetId { get; set; }
         
-        /// <summary>
-        /// Adds '=' to the beginning of the string to stop Excel removing the leading zeros
-        /// </summary>
-        public bool ExcelCsvFormat { get; set; }
+        public bool ExcelFormat { get; set; }
 
         // Device
         [Display(ShortName = "Device", Name = "Serial Number", Description = "The device serial number")]
@@ -135,7 +132,7 @@ namespace Disco.Models.Services.Devices.Exporting
             return new DeviceExportOptions()
             {
                 ExportType = DeviceExportTypes.All,
-                ExcelCsvFormat = true,
+                ExcelFormat = true,
                 DeviceSerialNumber = true,
                 ModelId = true,
                 ProfileId = true,

Disco.Models/Services/Devices/Exporting/DeviceExportResult.cs

@@ -4,7 +4,7 @@ namespace Disco.Models.Services.Devices.Exporting
 {
     public class DeviceExportResult
     {
-        public MemoryStream CsvResult { get; set; }
+        public MemoryStream Result { get; set; }
         public int RecordCount { get; set; }
     }
 }