Render an individual tiddler as a specified ContentType, defaulting to
text/html and save it to the specified filename.
Optionally the title of a template tiddler can be specified, in which case the template tiddler is rendered with the "currentTiddler" variable set to the tiddler that is being rendered (the first parameter value).
A name and value for an additional variable may optionally also be specified.
--rendertiddler <title> <filename> [<type>] [<template>] [<name>] [<value>]
By default, the filename is resolved relative to the
output subdirectory of the edition directory. The
--output command can be used to direct output to a different directory.
Any missing directories in the path to the filename are automatically created.
For example, the following command saves all tiddlers matching the filter
[tag[done]] to a JSON file titled
output.json by employing the core template
--rendertiddler "$:/core/templates/exporters/JsonFile" output.json text/plain "" exportFilter "[tag[done]]"