copyTemplate method
Make a deep copy of this Panel and allow it to be used as a template.
This makes copies of Bindings, unlike the regular copy() method.
 Pass true as the argument in order to freeze the Bindings,
 allowing it to operate efficiently as a template.
 A false value (which is the default) allows further additions/modifications
 of the bindings in the copied Panel.
 @since 2.2
 @param {boolean=} freeze whether to freeze the Bindings in the copy; default is false
 @return {Panel}
Implementation
_i3.Panel copyTemplate([_i2.bool? freeze]) => _i4.callMethod(
      this,
      'copyTemplate',
      [freeze ?? _i5.undefined],
    );