Auto merge of #8954 - nox:protochain, r=Ms2ger

Fix prototypes of interface objects (fixes #2665)

Callback interface objects' (i.e. NodeFilter's) prototype is now Object instead of
Function and non-callback interface objects' their proper ancestor, starting with
the Function prototype.

The function do_create_interface_objects is removed in favour of 4 functions:
create_callback_interface_object, create_interface_prototype_object,
create_noncallback_interface_object and create_named_constructors.

While this increases the amount of codegen'd code, this greatly improves the
readability of the code involved in this part of DOM, instead of having one function
doing 4 different things. We can always find a more adequate abstraction later.

NativeProperties and everything related to the interface objects have been removed
from the utils module.

Fixes #2665.

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