Support for 'namespaced' parameternames in hst component configuration

for something like behavioral targeting, we want to be able to specify different values for parameter for different persona's. For this, I discussed with Frank, we want to add a third multi-valued property in a hst:component configuration that is called: hst:parameternameprefixes. When it does not exist, it is ignored and behavior is like before. When it does exist, and has empty value, it also works as before. When it has a non-empty value, it's value is used for namespacing the parametername. Thus, suppose we have:

hst:parameternames =

{'pageSize', 'sortBy', 'pageSize'}

hst:parametervalues =

{'10', 'date', '5'}

hst:parameternameprefixes =

{'', '', developer}

This results in:

pageSize = 10
sortBy = date
developer:pageSize = 5

Where I now for display reasons, write ':' as delimiter