[startkde] Move more logic into startplasma-wayland from waylandsession
startplamsa-wayland and startplasma-waylandsession are split so that anything requiring an X or wayland connection happens in startplasma-waylandsession anything else can happen in the first binary.
I want to cut startplasma-waylandsession down to eventually be nothing other than X11 setup.
runStartupConfig and setting an env variable can happen before kwin. It might even fix a bug if kwin used any calls that rely on QLocale.