Muon 5.6.0

[Carlo Vanini]

New release of Muon (Package Manager), version 5.6.0.
This is the first release since the split from Muon-Discover (now
Plasma-Discover).

http://download.kde.org/stable/muon/5.6.0/src/muon-5.6.0.tar.xz.mirrorlist

* "Unmark all" can be undone/redone
* Fix crash when cache is reloaded [BUG: 332530]
* Fix muon not closing with window close button [BUG: 358659]
* Fix icons' names
* add keyboard shortcut to focus search box
* port away from KDELibs4Support
* Fix history dialog layout [BUG: 343992]