Email-ext defines a ${FILE, path='foo.txt'} token macro which makes it possible to read in the contents of a file.

This seems generic enough to be useful in many cases (like $PROPFILE), and indeed I wanted to integrate the $FILE macro into one of my plugins. But it seems weird to depend on the email-ext plugin, and I didn't really want to copy the code into my own plugin.

So would it be possible to move this macro implementation up to the token-macro-plugin itself?