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RackWidget: filter the rack correctly when the played word contains a blank
PlayWordMediator: improve the handling of words in Intermediate state.

The syntactically invalid words (such as those without matching parens)
are displayed in red, and do not trigger un update of the PlayModel.
As a result, the letters do not disappear from the preview anymore when
the opening parenthesis of a blank tile is typed.
Add a "Print preview" menu entry
Topping: keep track of the player score
Topping: add a preference to set the penalty value in case of timeout
Topping: better looking widget, and new field for the total score
Topping: do not show the lineEdit control showing points of the move
Stats: hide some information in topping mode