[RFC] Remove Xinerama related options

[Martin Gräßlin]

Hi workspace developers,

KWin provides the option to turn off multi screen aware window management. 
This results in windows being maximized over both screens or fullscreen 
windows being stretched over all screens. These options make the code much 
more complex and add confusing configuration dialogs to our workspace (see 
attached screenshot).

Example code:
int Workspace::numScreens() const
{
    if (!options->xineramaEnabled)
        return 1;
    return Kephal::ScreenUtils::numScreens();
}

I personally fail to understand why the options are needed and why they have 
been added in the first place. With git blame I was not able to go back so far 
in the history to find when they were added. Note: the xinerama code used also 
to be ifdefed, so I could imagine it being from a time back when multi screens 
was a new feature.

>From the userinterface the only useful option is "Show unmanaged windows on"  
which should be kept. All other options make in my opinion just no sense.

If nobody sees any good reason to keep these options I would prepare the 
removal.

The reason is btw not to remove options, but to decrease the complexity of the 
code as shown above and the fact that it is a break my system setting which 
happened more than once that users complained about maximize not working any 
more.

Cheers
Martin
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