Add option to automatically save configuration

[digitalethics]

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Upon switching to another launcher via Show Alternatives any changes a user has made to customize the menu are lost. Alternating between menus should not leave the user stranded and having to start customizing from scratch. This enhancement request is different from #19 to which I have also made another suggestion to make it less assuming for new and inexperienced users.

[mattalxndr]

I just did this by accident, and it's not the first time. But none of the widgets I have used retain configuration after removing them. So I view this as a problem to be solved in Plasma, not just in this widget. At least an undo button or something.

[mattalxndr]

Well, it seems that my comment has angered the Gods.

I reconfigured my desktop today (including this widget). But apparently my Dell starts to forget things from being unplugged from its dock for a couple of hours. Rebooted and now one of the monitors has the default background, no panels, like I just plugged it in for the first time.

Wish I'd saved that config.

+1 @digitalethics