[antlr-interest] Recursive conditional template output.

[Mark Wright]

Hello Craig,

An alternative idea is for the template to just
output it once, with the output like:

- a specal character sequence with the file name of the header
- header output
- a specal character sequence with the file name of the body
- body output

And then iterate over the template output, splitting it up,
and writing it to the header and body files.

Regards, Mark

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