Ct.js v4.0.1 — minor bug fixes and improvements

This update addresses several issues that were found in v4.0.0.

⚡️ General Improvements

• Changed button text from Save to Apply (#495 by @AnukratiMehta)
• Improve migration script for v4 to handle cases when assets had broken references to groups

🐛 Bug Fixes

• Fix migration code for v4 throwing an error if a project did not use fittoscreen catmod.
• Fix pointer.collides method
• Tabs of deleted assets must automatically close. Closes #491
• Update copies in room editors if their linked text style has changed. Closes #493

🍱 Demos, Dependencies and Stuff

• ⚡️ JettyCat’s example project should use a text base class for its highscore label in the defeat screen
• 🐛 Fix fullscreen switcher in Catformer example(#490 by @sk757a)

📝 Docs

• 💩 Use a vanilla document search
• Drop ct. prefix in catmod docs (#494 by @ehanahamed)