Fixed: canBecomeKeyWindow response for auxiliary windows.
Fixed: canBecomeKeyWindow response for auxiliary windows.

Without this fix Cappuccino always returned YES for `canBecomeKeyWindow` for every window. But in Cocoa, only "standard" windows with a title bar and/or resizing return YES.

With this fix Cappuccino better matches Cocoa's behaviour.

wangshijin/cappuccino,krodelin/cappuccino,primalmotion/cappuccino,FrankReh/cappuccino,rgv151/cappuccino,tancred/cappuccino,deltaprojects/cappuccino,Rosch/cappuccino,AlexanderMazaletskiy/cappuccino,FrankReh/cappuccino,krodelin/cappuccino,FrankReh/cappuccino,rgv151/cappuccino,zittix/cappuccino,tolmasky/cappuccino,wangshijin/cappuccino,kidaa/cappuccino,mrcarlberg/cappuccino,zittix/cappuccino,daboe01/cappuccino,enquora/cappuccino,krodelin/cappuccino,deltaprojects/cappuccino,tancred/cappuccino,tolmasky/cappuccino,enquora/cappuccino,cacaodev/cappuccino,deltaprojects/cappuccino,mrcarlberg/cappuccino,primalmotion/cappuccino,rgv151/cappuccino,Dogild/cappuccino,Dogild/cappuccino,cacaodev/cappuccino,kidaa/cappuccino,cacaodev/cappuccino,cappuccino/cappuccino,koamac/Cappuccino,FrankReh/cappuccino,enquora/cappuccino,zittix/cappuccino,cappuccino/cappuccino,cacaodev/cappuccino,zittix/cappuccino,AlexanderMazaletskiy/cappuccino,AlexanderMazaletskiy/cappuccino,tancred/cappuccino,kidaa/cappuccino,enquora/cappuccino,kidaa/cappuccino,mrcarlberg/cappuccino,AlexanderMazaletskiy/cappuccino,Rosch/cappuccino,daboe01/cappuccino,tolmasky/cappuccino,Rosch/cappuccino,krodelin/cappuccino,koamac/Cappuccino,Dogild/cappuccino,koamac/Cappuccino,mrcarlberg/cappuccino,cacaodev/cappuccino,daboe01/cappuccino,mrcarlberg/cappuccino,zittix/cappuccino,koamac/Cappuccino,Rosch/cappuccino,FrankReh/cappuccino,kidaa/cappuccino,primalmotion/cappuccino,deltaprojects/cappuccino,tancred/cappuccino,tolmasky/cappuccino,AlexanderMazaletskiy/cappuccino,FrankReh/cappuccino,zittix/cappuccino,krodelin/cappuccino,kidaa/cappuccino,rgv151/cappuccino,rgv151/cappuccino,daboe01/cappuccino,zittix/cappuccino,mrcarlberg/cappuccino,Rosch/cappuccino,koamac/Cappuccino,rgv151/cappuccino,cappuccino/cappuccino,cappuccino/cappuccino,cappuccino/cappuccino,enquora/cappuccino,daboe01/cappuccino,cacaodev/cappuccino,Dogild/cappuccino,cappuccino/cappuccino,primalmotion/cappuccino,cappuccino/cappuccino,daboe01/cappuccino,koamac/Cappuccino,wangshijin/cappuccino,mrcarlberg/cappuccino,krodelin/cappuccino,FrankReh/cappuccino,Dogild/cappuccino,daboe01/cappuccino,enquora/cappuccino,rgv151/cappuccino,deltaprojects/cappuccino,Dogild/cappuccino,mrcarlberg/cappuccino,wangshijin/cappuccino,enquora/cappuccino,wangshijin/cappuccino,FrankReh/cappuccino,Rosch/cappuccino,krodelin/cappuccino,tancred/cappuccino,primalmotion/cappuccino,deltaprojects/cappuccino,AlexanderMazaletskiy/cappuccino,tolmasky/cappuccino,primalmotion/cappuccino,tancred/cappuccino,cacaodev/cappuccino,Rosch/cappuccino,Dogild/cappuccino,primalmotion/cappuccino,wangshijin/cappuccino,deltaprojects/cappuccino