RFC: Rename "kwin_wayland" executable to "kwin"
At the moment, kwin provides two executables - kwin_x11 and kwin_wayland. As the names suggest, one is X11 flavor of kwin and another one is wayland flavor.
Standalone X11 backend is deprecated and it can be even potentially dropped in Plasma 6 (the version scheme may change), therefore renaming "kwin_wayland" to "kwin" will serve as a way to indicate that we want kwin/wayland to succeed as kwin and kwin_x11 is more a legacy thing that you should avoid.
As a step forward, "kwin_x11" can be renamed to "kwin_legacy"