Forces the value to a list.
This is especially useful for loops using the {% for %} tag.
For example:
{{ value|make_list }}
When value is the tuple {"a","b"} then the output is the list ["a","b"].
When the input is a model, this filter forces the model to call its m_to_list/2 function, which is used to iterate over an entire model, e.g.:
{% print m.req|make_list %}
This will show something like:
[{version,{1,1}},
{peer,"127.0.0.1"},
Instead of printing just {m, req, undefined} when the filter was not applied.