Allow markdown in multiple-choice question options

src/pretix/base/templates/pretixbase/forms/widgets/checkbox_option_with_links.html

@@ -0,0 +1,2 @@
+{% load rich_text %}
+{% if widget.wrap_label %}<label{% if widget.attrs.id %} for="{{ widget.attrs.id }}"{% endif %}>{% endif %}{% include "django/forms/widgets/input.html" %}{% if widget.wrap_label %} {{ widget.label|rich_text_snippet }}</label>{% endif %}