plasma5: begin NixOS module
environment: add plugin paths
extra-cmake-modules: use /lib as LIBDIR universally
plasma-workspace: patch startkde
desktop-managers: add plasma5
autonix: add documentation
kf5, plasma5: control outputs more carefully
plasma-workspace: remove oxygen-fonts patch
kf-package: move XDG_DATA_DIRS setup-hook here
all-packages: rename top-level plasma attributes