Improve settings logic and layout

• Moved Copy file location to clipboard after saving to the General tab.
• Rearranged it like this (see screenshot below).
• Renamed When Spectacle is running to While Spectacle is running
• Added check to avoid settings that don't make sense. Example: Check all three Copy image to clipboard, Autosave the image to the default location & Copy file location to clipboard after saving. Since having the option to save the image to the clipboard, autosave it to the default location and then overwrite the image in the clipboard with the image location doesn't make sense.
• Fixes Bug 420477: https://bugs.kde.org/show_bug.cgi?id=420477 "Spectacle hotkey captures do not copy to clipboard" -> fixes bug mentioned in the last comment "kinghat 2020-08-06 17:39:20 UTC" , since now it's not possible to have all three options active at the same time (the one in "after taking a screenshot").

Before:

After:

Functional change:

Peek_2020-06-06_23-13