Allow dereferencing of non-objects accross all supported PHP versions

[wisskid]

Fixes #831

[rudiedirkx]

I have no idea what DereferencingNonObjects is, so I would put all those error suppression in the same config, but sure, this works 👍

[rudiedirkx]

What about

class Foo {}
$smarty->assign('object', new Foo);
====
{{$object->name}}

? Is that caught too? A non-existing property of a valid object? Or a protected/private property of an object, which is probably a different message:

class Foo {
  protected $name = 'Bar';
}
$smarty->assign('object', new Foo);
====
{{$object->name}}