Added property types to window module
Added property types to window module

Closes https://github.com/PistonDevelopers/event/issues/265

bvssvni/piston,bvssvni/piston,PistonDevelopers/piston,KevinFrans3/piston,bvssvni/event,getynge/piston,tempbottle/piston,axelmagn/piston,PistonDevelopers/piston,caldwell/piston,Potpourri/piston,placrosse/piston,mitchmindtree/piston,oldmanmike/piston