eina_cxx: Add missing methods to Eina C++ wrappers

Also fix release_native_handle type error on mutable ranges.

src/bindings/eina_cxx/eina_accessor.hh

@@ -119,6 +119,17 @@ struct accessor_common_base
     return _impl;
   }
 
+  /**
+   * @brief Release the handle of the wrapped @c Eina_Accessor.
+   * @return Handle for the native @c Eina_Accessor.
+   */
+  Eina_Accessor* release_native_handle()
+  {
+    auto h = _impl;
+    _impl = nullptr;
+    return h;
+  }
+
   /**
    * @brief Swap content between both objects.
    * @param other Other accessor object.

src/bindings/eina_cxx/eina_iterator.hh

@@ -95,6 +95,22 @@ public:
     return *this;
   }
 
+
+  /**
+   * @brief Get the handle for the wrapped @c Eina_Iterator.
+   * @return Internal handle for the native Eina iterator.
+   *
+   * This member function returns the native @c Eina_Iterator handle
+   * that is wrapped inside this object.
+   *
+   * @warning It is important to take care when using it, since the
+   * handle will be automatically release upon object destruction.
+   */
+  Eina_Iterator* native_handle() const
+  {
+    return _iterator;
+  }
+
 protected:
   /**
    * @internal

src/bindings/eina_cxx/eina_list.hh

@@ -511,6 +511,7 @@ public:
   using _base_type::crend;
   using _base_type::swap;
   using _base_type::native_handle;
+  using _base_type::release_native_handle;
 };
 
 template <typename T>
@@ -613,6 +614,7 @@ public:
   }
   using _base_type::swap;
   using _base_type::native_handle;
+  using _base_type::release_native_handle;
 
   friend bool operator==(range_list<T> const& rhs, range_list<T> const& lhs)
   {

src/bindings/eina_cxx/eina_range_types.hh

@@ -276,7 +276,7 @@ struct _mutable_range_template : _const_range_template<T, Traits>
   {
     auto h = _handle;
     _handle = nullptr;
-    return h;
+    return const_cast<native_handle_type>(h);
   }
 
   /**