ExtractArgsFromContainer.Rdextracts values out of container where the names of
             the values intersect with argNames.
ExtractArgsFromContainer(argNames, container)
| argNames | a character vector of argument names.  | 
    
|---|---|
| container | either a list or environment that contains named values.  | 
    
list of named values from container where argNames
        intersects with container