[PyQt] star delegate example for current PyQt snapshot

[Hans-Peter Jansen]

Hi Phil et al.,

now, that you added __lshift__ for QPolygonF()'s, here's the star 
delegate example in return, using this feature of course.

I did change the behavior a minor bit, but it feels silly to be forced 
to select _and_ double click an item in order to trigger editing. 
Double clicking should suffice, no matter if a row is selected or not, 
doesn't it? 

Also these stars gets activated, if the pointer crosses its center 
horizontally. Hence, a zero star voting is possible, too.

I hope, you like it,
Pete
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