v4.2.0 - Windows fixes, Display Modes, Big Sur fixes

What's Changed

• Fix .at polyfill to prevent blank screen by @remy in #217
• Adds support for display modes & the core's info.txt by @neil-morrison44 in #218
• Fix filesystem things on windows by @neil-morrison44 in #219
• Improves the app's response to when only the content of a file changes by @neil-morrison44 in #221

Full Changelog: v4.1.0...v4.2.0