routing: Fix breakages with routing on some versions of Python. Finally figured what happened with change 6baa94da8b16 (this is a Mercurial hash by the way if you're looking at the Git mirror). Between Python 3.6 and 3.7 there was a change where the percent sign ('%') went from being escaped by `re.escape` to _not_ being escaped. So now we need to use different regex patterns dependin on the Python version, yay.

---
title: Plugin Components
---

Once you've [created a plugin][1], you need to make it provide new _components_.

{% for comp in family.children -%}
* [{{comp.title}}]({{comp.url}})
{% endfor %}

[1]: {{apiurl('plugins')}}