[Feature Request] Filter with arguments

[Kolen Cheung <christian.kolen-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

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Currently, if one need to pass arguments to a filter, one need to pipe it 
through.

It would be convenient in some cases to allow passing argument to filters. 
e.g.

pandoc -F "pantable -t csv" -s -o example.tex example.md# which is equiv. to
pandoc -t json -s example.md | pantable -t csv | pandoc -f json -s -o example.tex

To elaborate a little bit further: I want to write a filter that at the 
same time do:

   1. convert code block to table 
   2. convert pandoc tables to code block, potentially with different 
   output code formats (e.g. csv, yaml, json, etc. or even other kinds e.g. 
   HTML, Div with CSS table, etc.) 
   3. standalone cli. i.e. not a filter 

Right now (1) and (2) are mutually exclusive and has to be split into 2 
filters. (1) and (3) can potentially be written in the same executable, but 
it is uglier and pointless to do so without including (2).
​

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