Delete KLKT as it is no longer maintained

src/klkt/icons.qrc

-<RCC>
-    <qresource prefix="/icons">
-        <file alias="LICENSE">icons/LICENSE</file>
-        <file alias="pause.png">icons/pause-fill.png</file>
-        <file alias="play.png">icons/play-fill.png</file>
-        <file alias="README">icons/README</file>
-        <file alias="previous.png">icons/skip-back-mini-fill.png</file>
-        <file alias="next.png">icons/skip-forward-mini-fill.png</file>
-        <file alias="stop.png">icons/stop-fill.png</file>
-        <file alias="shuffle.png">icons/shuffle-line.png</file>
-    </qresource>
-</RCC>

src/klkt/icons/LICENSE

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src/klkt/icons/README

-Icons from https://github.com/Remix-Design/RemixIcon
-APACHE 2.0 License, see LICENSE file in this directory.

src/klkt/klkt.cpp

-#include "klkt.hpp"
-
-#ifdef __linux__
-#include <sys/prctl.h>
-#include <signal.h>
-#endif
-
-int
-main(int argc, char **argv)
-{
-#ifdef __linux__
-    /* Dies when the parent dies */
-    prctl(PR_SET_PDEATHSIG, SIGHUP);
-#endif
-
-    Application app(argc, argv);
-    int code = app.exec();
-    notify_uninit();
-    return code;
-}

src/klkt/klkt.pro

-QT += core gui network
-greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
-
-QT_CONFIG -= no-pkg-config
-CONFIG    += c++17 console
-CONFIG    -= app_bundle
-CONFIG	  += link_pkgconfig
-PKGCONFIG += libnotify
-
-DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000
-
-SOURCES +=                          \
-        klkt.cpp                    \
-
-HEADERS +=                          \
-        klkt.hpp                    \
-        ../../inc/lektor/icon.xpm   \
-        ../../inc/lektor/common.h   \
-
-INCLUDEPATH +=                      \
-        ../../inc/
-
-# Default rules for deployment.
-qnx: target.path = /tmp/$${TARGET}/bin
-else: unix:!android: target.path = /opt/$${TARGET}/bin
-!isEmpty(target.path): INSTALLS += target
-
-RESOURCES += \
-    icons.qrc