Revamp the shapedclock example

Rename it to "Translucent Background", as that's what the example shows
how to do. And modern applications shouldn't use a (binary) mask to
create shaped windows. Instead, set the TranslucentBackground attribute,
don't paint pixels that should be fully transparent and use anti-aliased
or semi-opaque painting for pixels that should be translucent.

Adjust the example and documentation accordingly. Move the statment that
widget masks create coarse visual clipping to the QWidget::setMask
documentation.

Pick-to: 6.5
Change-Id: Id49d854093f2cb471afb178d32723081c7543543
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>

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