add support for REST-ful API building

- allow parameters within url
- allow different methods other then just POST
-> still needs to be tested!

Pilz.UI/Controls/ConfigurationManager/ConfigurationManager.cs

@@ -0,0 +1,20 @@
+namespace Pilz.UI.Controls.ConfigurationManager;
+
+public class ConfigurationManager
+{
+    private readonly List<ConfigurationPanel> panels = [];
+
+    public void Register(ConfigurationPanel panel)
+    {
+        panels.Add(panel);
+    }
+
+    public IEnumerable<Control> Build()
+    {
+        foreach (var panel in panels)
+        {
+            panel.Build(this);
+            yield return panel;
+        }
+    }
+}