views: Add datatable initialization macro
views: Add datatable initialization macro

To make the usage of datatables even more convenient, we add a macro
that can be used in templates.

All that is necessary is an import like:
{% import "macros/datatables.twig" as datatables %}

Afterwards you can initialize a datatable on a table with the id
'issues' with:

<script type='text/javascript'>
    {{ datatables.init('issues') }}
</script>

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