QIconEngine virtual_hook() support

[Maurizio Berti]

QIconEngine does not support virtual_hook().

At this time, this is not a huge problem with Qt6, as they made isNull()
and scaledPixmap() virtual since 6.0.
Yet, I also realize that Qt5 is fundamentally EOL (but we know it's still
in use), but I also think that we cannot exclude the possibility of future
Qt6/7 versions that may add further hooks (who knows, maybe they may want
to add support for emojis in QIcon - I actually thought about that) while
"forgetting" related virtual functions again in the meantime, unless they
decide to drop the virtual_hook approach to begin with.

I don't have enough C++/sip knowledge to understand if there may be
limitations from the Python perspective, but, if there aren't, would it be
possible to add virtual_hook() to Qt6 (and, possibly, Qt5 as well)?

If it's not possible for specific C++/Python technical reasons, I'd still
be curious to know the reason, just for the sake of understanding.

Best regards,
MaurizioB
-- 
È difficile avere una convinzione precisa quando si parla delle ragioni del
cuore. - "Sostiene Pereira", Antonio Tabucchi
http://www.jidesk.net
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