[dev] Widget preserver

[Duck]

Is often that we add multiply variables to a pager of other widgets. Why not 
create a method that allows to pass an array of parameters at once (like 
posted search forum data). It will minimize the implementation code and make 
it cleaner. I attached an preserveMultiply function example, but it can be 
done with extending the existing preserve() like we have with 
Util::addParameter().

Duck
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