reagentgrinder ecs & xamlui (#4347)

* started converting grinder to ecs

* finished reagentcontainer ecs
refactored bui
converted ui to xaml

* adds handling

* fixes handling

* oopsie

Co-authored-by: Paul <ritter.paul1+git@googlemail.com>

Content.Client/Kitchen/UI/LabelledContentBox.xaml.cs

@@ -0,0 +1,15 @@
+using Robust.Client.AutoGenerated;
+using Robust.Client.UserInterface.Controls;
+
+namespace Content.Client.Kitchen.UI
+{
+    [GenerateTypedNameReferences]
+    public partial class LabelledContentBox : BoxContainer
+    {
+        public string? LabelText { get => Label.Text; set => Label.Text = value; }
+        public string? ButtonText { get => Button.Text; set => Button.Text = value; }
+
+        public ItemList BoxContents => ItemList;
+        public Button EjectButton => Button;
+    }
+}