0.13.0

NOTE: This release contains the fix for CVE-2020-5257, which
fixes a potential SQL injection on dashboard sorting.

• [SECURITY] Fix Sort order SQL injection.
• [BUGFIX] [#1561] Fix very narrow nested fields.
• [BUGFIX] [#1565] Fix unterminated single quote.
• [UI] [#1537] Provide <title> tags for doc pages.
• [BUGFIX] [#1552] Use the correct foreign key when sorting belongs_to
  associations.
• [FEATURE] [#1551] More readable warnings.
• [FEATURE] [#1512] Avoid confusion with class methods and protected/private
  modifiers.
• [FEATURE] [#1513] Accessible from templates; avoids having to create new
  field types.
• [UI] [#1536] Declare doctype, language and charset.
• [DOC] [#1540] Add new Date field to docs.
• [FEATURE] [#1530] Include Date Field.
• [BUGFIX] [#1522] Align label and data on show page.
• [FEATURE] [#1521] Expose required fields on form.
• [DOC] [#1531] Remove project level rubocop.yml.
• [DOC] [#1534] Move documentation of how to disable some actions on
  controller.
• [UI] [#1524] Hide resources without index in the navigation.
• [DOC] [#1523] Update screenshot.
• [UI] [#1376] Add a "back" link to the navigation.
• [DOC] [#1187] Update comment with new namespace.
• [DOC] [#1514] Rewrite the contributing guide.
• [BUGFIX] [#1495] Attempt to fix random CI failures.
• [BUGFIX] [#1507] Remove query from link, to avoid triggering banned params.
• [DOC] [#1479] Document controller APIs.
• [COMPAT] [#1475] Allows running specs individually.
• [UI] [#1484] Double-click to select attribute text.
• [DOC] Configure GitHub Sponsors.
• [COMPAT] [#1457] Fix PhantomJS test behaviour on Linux.
• [BUGFIX] [#920] Remove NameError rescue in page base.
• [BUGFIX] [#1447] Don't pass raw SQL when changing sort order.
• [FEATURE] [#1452] Support Sprockets 4.
• [DOC] [#1426] Add issue templates.