Reinstated screen capture feature

Minor bug fixes and improvements

Improved support for Big Sur and Apple Silicon Macs

Dark Mode!

Replaced the numerous small prompts to view my other apps with one big prompt to view my other apps. Other minor bug fixes and enhancements.

You're now prompted to join my mailing list; I hope you will. To avoid conflicts with other apps, I've changed the keyboard shortcuts to: Option - Control - A: Show Hide App Option - Control - O: Open image selector