add getParam(key) helper function
add getParam(key) helper function

 - instead of direct access this uses QHash::value(key) function to
 avoid silent insertion of elements

Signed-off-by: Petar Koretic <0bdc63247af490de2e3f3da15a8939ec28fc7d99@gmail.com>

xwalk/recurse,qaap/recurse