v1.3.0 added screenshots and improved reliability/efficiency

• Warning alerts now show a screenshot of the View/ViewController that has leaked.
• Deinit alerts now have a greenish background to make them more distinct from red warning alerts.
• Much improved detection algorithm that is even more reliable and efficient than before.
• Now also tested and tweaked for Catalyst apps.

v1.2.0 improved backwards compatibility

Made tweaks so it passes all the build tests from Swift 5.3/Xcode 12.4 and up, as listed here:
https://swiftpackageindex.com/Janneman84/LeakedViewControllerDetector/builds

v1.1.0 improved efficiency

Significantly improved the efficiency of the leak detection algorithm. It should be fast enough for most apps to be used in release builds.