Add ability for image-only screenshots

[guidocelada]

It would be really nice if the app also supported the ability to take image-only screenshots, with an editor to add arrows or highlighted areas, the possibility to pixelate areas containing sensitive data, and the option to add a blurred macOS background, as already found in the video editor.

Great app, keep up the good work!

[linear[bot]]

CAP-477 Add ability for image-only screenshots