| DojoConfig Dojo configuration holder helper
 this is a helper class to generate
 a dojo configuration
 if a null value is set the toString
 ignores the djconfig
 the toString method generates a full djconfig
 Warning if you adjust the dojo config params
 do it before rendering
 because this stuff is shared in the request
 as a singleton value in normal circumstances!
 (unless you want to influence the dojo config
 seriously afterwards please, follow this guideline
 use the decode phase or something similar if not available)
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