Fix display of GST amount

Move GST rate to settings. Set to Australian GST rate.

Fix price filter

Label or help text could be unassigned, so convert to empty string.

Allow admin to manage own proposals

Do not block admins from changing votes, result or messaging
on their own proposals.

Finalise registration

Add shirt types and sizes. Improve messaging about discounts.
Restyle ticket wizard and product category screens. Enable page titles
and messages. Update dashboard to hide raffle.
Enable inventory population for dev container.

Fix regidesk base url

Simplify regex for URL per Django warning (remove starting /).

Fix teams on dashboard

Use rows and columns for team layout instead of card group.

Update fixtures

Remove fixtures from 2018 and 2019. Add fixtures for 2020.
Cleanup structure of fixtures directory. Update scripts to match.

Add LCA2020 Miniconfs

Setup proposals for miniconfs, including model, forms and admin.

Improve proposal reviews

Display talk format or proposal kind on review tables and in CSV.
Add suggested status to CSV output, for auto-accept and auto-reject.
Add endpoint to download CSV of proposals for section.

Improve proposal/review styling

Use correct block for page titles. Fix element styles to be consistent
across site. Use fluid layout for review to enable sidebar.

Add assistance details field to speaker

Add multiline text field to gather details on travel and accommodation
assistance to help with speaker acceptance planning.

Switch to LCA2020

Remove LCA2018 and LCA2019 styles and content.
Add base LCA2020 styling and update references to year.

Remove LCA2019 miniconf proposal types

Remove models and forms for miniconf specific proposals.

Fix padding for schedule

Add column to layout so mobile has padding. Use container to wrap schedule so padding and
centred table applies to all views.

Revert "Add debug logging for product availability checks"

This reverts commit e723ec937b4e9d69686b0a0e5827d698b89bcfcb.

This wasn't meant to be added to the dev branch yet.

Send errors from boarding pass emails to error log

Help troubleshoot errors