Replace button serializable action with unity event. Rename package namespace names to follow typical conventions.

Editor/PropertyDrawer/SerializableFuncBasePropertyDrawer.cs

@@ -5,7 +5,7 @@ using System.Collections.Generic;
 using System.Linq;
 using System.Reflection;
 using System.Text;
-using SerializableFunc.Runtime;
+using SerializableFunc;
 using UnityEditor;
 using UnityEditor.UIElements;
 using UnityEditorInternal;

Runtime/SerializableAction.cs

@@ -4,7 +4,7 @@ using System.Reflection;
 using UnityEngine;
 using Object = UnityEngine.Object;
 
-namespace SerializableFunc.Runtime
+namespace SerializableFunc
 {
     [Serializable]
     public class SerializableAction

Runtime/SerializableFunc.Runtime.asmdef

@@ -1,6 +1,6 @@
 {
     "name": "SerializableFunc.Runtime",
-    "rootNamespace": "SerializableFunc.Runtime",
+    "rootNamespace": "SerializableFunc",
     "references": [],
     "includePlatforms": [],
     "excludePlatforms": [],

Runtime/SerializableFunc.cs

@@ -1,6 +1,6 @@
 using System;
 
-namespace SerializableFunc.Runtime
+namespace SerializableFunc
 {
     [Serializable]
     public class SerializableFunc<TReturn> : SerializableFuncBase<Func<TReturn>>

Runtime/SerializableFuncBase.cs

@@ -3,7 +3,7 @@ using System.Linq;
 using System.Reflection;
 using UnityEngine;
 
-namespace SerializableFunc.Runtime
+namespace SerializableFunc
 {
     [Serializable]
     public abstract class SerializableFuncBase<TFuncType> where TFuncType : Delegate