initial refactor of device export so it can be reused for future exporting

Disco.Models/Exporting/IExportOptions.cs

@@ -0,0 +1,12 @@
+using Disco.Models.Exporting;
+
+namespace Disco.Models.Services.Exporting
+{
+    public interface IExportOptions
+    {
+        ExportFormat Format { get; }
+        string FilenamePrefix { get; }
+        string ExcelWorksheetName { get; }
+        string ExcelTableName { get; }
+    }
+}