* refactor: Update call to deprecated add_event_info_to_session_qs
* feat: Gather proceedings sessions in the view, grouped by name
* feat: Begin using new session data format in templates (WIP)
* feat: Show non-meeting groups (WIP)
Non-meeting groups (all sessions are notmeet) now show up on the proceedings.
Session materials associated with these groups are not shown, need to restore
that functionality.
* refactor: Rework template data, show materials for notmeet groups (WIP)
* fix: Restore "No agenda", etc, when meeting materials are not present
* chore: Remove commented out old code
* fix: Restore contents in non-area sections of proceedings
* chore: Remove commented-out stale code
* fix: Suppress duplicate agendas for a group on proceedings
* refactor: Generalize agenda deduplication and apply to minutes
* refactor: Format multiple items per session; apply to bluesheets
* refactor: Apply _format_materials to recordings, slides, and drafts
* chore: Add comment about limitations of test_proceedings() test
* test: Test separation of named sessions in the proceedings
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