feature: option to disable pop-up after copying

[atomGit]

for me the pop-up is unnecessary since i never edit it's contents

the ability to set a default format is useful however, so i might propose a change where the pop-up keeps the current "set as default" option and 2 other options are added;, "disable automatic popup" and "copy" (the latter so that one could still copy using the pop-up instead of using a hotkey)

strike that - what i struck out above can already be done from the toolbar icon, so new features would be needed (other than to hide the pop-up when copying)