[Lazarus] TMemo doesn't have OnMouseWheelxxx events

[Kostas Michalopoulos]

> Why doesn't TMemo have OnMouseWheel, OnMouseWheelUp and
> OnMouseWheelDown events? Yet TListBox does. Is this by design, or an
> oversight?

Probably an oversight since wheel events were added a little later and even 
without my previous patch (see the topic about wheel events in 
non-TWinControl controls), TMemo was a descedant of TWinControl. I attach a 
patch against revision 15313 which adds these properties. I tested them and 
they work fine.

Kostas
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