Multiple merge requests for konsole

[Konstantin Kharlamov]

Per comments on phabricator, I'm duplicating that I sent merge requests 
here:

1. "Detect and use ccache" 
https://invent.kde.org/kde/konsole/merge_requests/26
2. "Replace obsolete qCopy with std::copy" 
https://invent.kde.org/kde/konsole/merge_requests/27
3. "ColorScheme: fix warning: "assignment from temporary 
initializer_list"" https://invent.kde.org/kde/konsole/merge_requests/28