[pdal] variable argument names

[Howard Butler]

ProgramArgs can bind to a nl::json. See readers.ept for inspiration. 

> On Nov 22, 2019, at 4:58 PM, Norman Barker <norman.barker at gmail.com> wrote:
> 
> 
> Hi,
> 
> when configuring a pipeline stage we can add named arguments to the plugin, e.g. TileDBWriter we can set a `compression` property.
> 
> How would I define a map of properties, e.g. I have a named property called compression and within that I have a map (json object) of the compression type per attribute name? Currently ProgramArgs supports lists but not maps.
> 
> I can hack something for review, but I thought I would ask first for ideas.
> 
> Norman
> 
> 
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