Update arclight engine to v1.1.0, refactor local mods, esp. removing ones that are now in core. Closes ARK-70
- Patch accessibility issues addressed in 1.1.0 (ARK-49)
- Get core bugfixes for bookmark checkboxes (ARK-54), date range (ARK-66), creator links (ARK-69)
- Remove local NormalizedDate class (now fixed in core)
- Remove most of the DUL-custom EAD->HTML formatting helpers (now in core)
- Remove DUL hacks to get underscores in component URLs (now default in core)
- Update solr schema.xml & solrconfig.xml with v1.1.0 improvements
- Resume running accessibility specs in CI for all branches
- Fix local dockerized selenium JS feature tests (ARK-64)