Bugfix - DllManipulator.UnloadAll()

Delegate fields of native functions were not nulled out when dll was unloaded, which caused calls to stale native delegate.

Author: mcpiroman

src/DllManipulator.cs

@@ -153,6 +153,11 @@ public static void UnloadAll()
                     dll.loadingError = false; 
                     dll.symbolError = false; 
 
+                    foreach(var func in dll.functions)
+                    {
+                        func.@delegate = null;
+                    }
+
                     if(!success)
                     {
                         Debug.LogWarning($"Error while unloading DLL \"{dll.name}\" at path \"{dll.path}\"");
@@ -440,4 +445,4 @@ public enum LinuxDlopenFlags : int
         Lazy_Global = 0x00100 | Lazy,
         Now_Global = 0x00100 | Now
     }
-}
+}