add generic Get and GetAll methods

Pilz.Plugins.Advanced/PluginFeatureController.cs

@@ -1,4 +1,5 @@
-using System.Reflection;
+using Pilz.Plugins.Advanced.Exceptions;
+using System.Reflection;
 
 namespace Pilz.Plugins.Advanced;
 
@@ -193,7 +194,24 @@ public class PluginFeatureController
 
         public virtual IEnumerable<PluginFeature> GetAll()
         {
-            return controller.features.ToArray();
+            return [.. controller.features];
+        }
+
+        public virtual IEnumerable<T> GetAll<T>() where T : PluginFeature
+        {
+            return controller.features.OfType<T>();
+        }
+
+        public virtual T? Get<T>() where T : PluginFeature
+        {
+            return GetAll<T>().FirstOrDefault();
+        }
+
+        public virtual T? Get<T>(bool throwIfNull) where T : PluginFeature
+        {
+            if (Get<T>() is T feature)
+                return feature;
+            throw new PluginFeatureNotFoundException();
         }
 
         public virtual IEnumerable<PluginFeature> Get(string featureType)
@@ -221,7 +239,7 @@ public class PluginFeatureController
     {
         public override IEnumerable<T> GetAll()
         {
-            return controller.features.OfType<T>();
+            return GetAll<T>();
         }
 
         public override IEnumerable<T> Get(string moduleType)