Export django model choices for icons

Based on icon lists, maybe be able to specify a set

mentioned in issue AlekSIS/official/AlekSIS-Core#674 (closed)

assigned to @nik

changed title from Export django model coices for icons to Export django model choices for icons

created branch 8-export-django-model-coices-for-icons to address this issue

mentioned in merge request !6 (merged)

closed with merge request !6 (merged)

mentioned in commit a9156024