DictionarySectionHandler
Simple dictionary config factory
config is a dictionary mapping key->value
<add key="name" value="text"> sets key=text
<remove key="name"> removes the definition of key
<clear> removes all definitions
Make the name of the key attribute configurable by derived classes.
Make the name of the value attribute configurable by derived classes.
public DictionarySectionHandler()
Given a partially composed config object (possibly null)
and some input from the config system, return a
further partially composed config object