Add button to consolidate firewires.

DiscImageChef.Server/Areas/Admin/Controllers/FireWiresController.cs

@@ -1,3 +1,4 @@
+using System;
 using System.Linq;
 using System.Threading.Tasks;
 using DiscImageChef.CommonTypes.Metadata;
@@ -102,5 +103,7 @@ namespace DiscImageChef.Server.Areas.Admin.Controllers
         }
 
         bool FireWireExists(int id) => _context.FireWire.Any(e => e.Id == id);
+
+        public IActionResult Consolidate() => throw new NotImplementedException();
     }
 }

DiscImageChef.Server/Areas/Admin/Views/FireWires/Index.cshtml

@@ -33,6 +33,7 @@
     // Copyright © 2011-2019 Natalia Portillo
     // ****************************************************************************/
 }
+<a asp-action="Consolidate" class="btn btn-primary">Consolidate</a>
 <table class="table">
     <thead>
     <tr>