Add RequireInterfaceAttibute

RequireInterfaceAttribute.cs

@@ -0,0 +1,17 @@
+using UnityEngine;
+/// <summary>
+/// Attribute that require implementation of the provided interface.
+/// </summary>
+public class RequireInterfaceAttribute : PropertyAttribute
+{
+    // Interface type.
+    public System.Type requiredType { get; private set; }
+    /// <summary>
+    /// Requiring implementation of the <see cref="T:RequireInterfaceAttribute"/> interface.
+    /// </summary>
+    /// <param name="type">Interface type.</param>
+    public RequireInterfaceAttribute(System.Type type)
+    {
+        this.requiredType = type;
+    }
+}

tmp.txt

@@ -1 +0,0 @@
-