Pre-release Bolt 4.0.0-RC.42

🐛 Bug fixes

• Support taxonomies in title_format and excerpt_format (bobdenotter, #1838)
• Removed faulty definition to show timeSelection in Date Picker (develth, #1837)
• Imagelists and Filelists work in collections (I-Valchev, #1835)
• Listing search uses correct config. Add --like option to query params search (I-Valchev, #1829)
• Add pattern url and email options as shown in the docs (I-Valchev, #1828)
• Prevent recursion in title_format (bobdenotter, #1827)
• Clear menu caches on content delete. Log delete event. (I-Valchev, #1824)
• Search without author returns results (I-Valchev, #1823)
• Don't break if we're trying to get content for "no ContentTypes" (bobdenotter, #1822)
• Allow src in iframes for embeds to work. Add spinner feedback while embed is loading. (I-Valchev, #1820)
• Pass in record with Set partial (bobdenotter, #1842)

📦 Additions and new features

• Use configured upload_location for images and files in ContentTypes (bobdenotter, #1834)
• Collapsible collections (I-Valchev, #1830)

🛠️ Miscellaneous

• Add fixture_format option to fields (I-Valchev, #1841)
• Make placeholders() accept null for robustness (bobdenotter, #1840)
• Deprecate use of Symfony 4 (I-Valchev, #1839)
• Update top toolbar. Kill your darlings! (bobdenotter, #1836)
• Update _taxonomylinks.html.twig: fix link (bobdenotter, #1832)
• Listing singleton uses record_route setting (I-Valchev, #1826)

🤖 Tests

• Use travis_retry command on frequently failing behat tests (I-Valchev, #1831)
• Run tests in prod (I-Valchev, #1804)