kdeFrameworks: fixup inputs and outputs

- Reduce environment pollution with a separate $bin output containing programs,
  plugins, and shared data. Libraries remain in $out and are not installed into
  the environment.
- Only propagate build inputs as required.

pkgs/development/libraries/kde-frameworks/kactivities-stats.nix

@@ -1,8 +1,14 @@
-{ mkDerivation, lib, extra-cmake-modules, boost, kactivities, kconfig }:
+{
+  mkDerivation, lib,
+  extra-cmake-modules,
+  boost, kactivities, kconfig, qtbase,
+}:
 
 mkDerivation {
   name = "kactivities-stats";
   meta = { maintainers = [ lib.maintainers.ttuegel ]; };
   nativeBuildInputs = [ extra-cmake-modules ];
-  propagatedBuildInputs = [ boost kactivities kconfig ];
+  buildInputs = [ boost kactivities kconfig ];
+  propagatedBuildInputs = [ qtbase ];
+  outputs = [ "out" "dev" ];
 }