[lazarus] Patch: window subclassing, paint messages

[Micha Nelissen]

Hi,

Attached is a patch to implement proper window subclassing and paint
messages. This will enable _LARGE_ parts of the lcl code with respect to the
interface because we actually get messages like listbox insertitem etc.
Speedbuttons will now also be drawn correctly, groupboxes are drawn
correctly...etc.

In wincontrol.inc I have changed the defaulthandler to send a message. This
is still up for debate, and I don't know the effects on the GTK. Comments
are welcome.

Diff was taken from the root of lazarus.

Regards,

Micha.

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