New Breadcrumb user control

New Breadcrumb service
WIP icons and back button behavior

ModernKeePass.Application/Common/Interfaces/IBreadcrumbService.cs

@@ -0,0 +1,12 @@
+using System.Collections.Generic;
+using ModernKeePass.Application.Common.Models;
+
+namespace ModernKeePass.Application.Common.Interfaces
+{
+    public interface IBreadcrumbService
+    {
+        void Push(BreadcrumbItem item);
+        BreadcrumbItem Pop(int count = 1);
+        IEnumerable<BreadcrumbItem> GetItems();
+    }
+}