Delete KLKT as it is no longer maintained

src/klkt/icons.qrc

src/klkt/icons/LICENSE

src/klkt/icons/README

src/klkt/icons/pause-fill.png

src/klkt/icons/play-fill.png

src/klkt/icons/shuffle-line.png

src/klkt/icons/skip-back-mini-fill.png

src/klkt/icons/skip-forward-mini-fill.png

src/klkt/icons/stop-fill.png

src/klkt/klkt.cpp

src/klkt/klkt.hpp

src/klkt/klkt.pro