templater: provide loop counter as "index" keyword This was originally written for JSON templating where we would have to be careful to not add extra comma, but seems generally useful. Inner loop started by % operator has its own counter.

# See http://EditorConfig.org for the specification

root = true

[*.py]
indent_size = 4
indent_style = space
trim_trailing_whitespace = true

[*.{c,h}]
indent_size = 8
indent_style = tab
trim_trailing_whitespace = true