Subcommand of [dict] that returns a subset of a dictionary according to some filtering rule.
    :   '''dict filter''' ''dictionaryValue'' '''key''' ''globPattern''
    :   '''dict filter''' ''dictionaryValue'' '''value''' ''globPattern''
    :   '''dict filter''' ''dictionaryValue'' '''script {''' ''keyVar valueVar'' '''}''' ''script''
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%| [Category Command] |%
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