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/frameworkintegration.nix

@@ -9,8 +9,9 @@ mkDerivation {
   name = "frameworkintegration";
   meta = { maintainers = [ lib.maintainers.ttuegel ]; };
   nativeBuildInputs = [ extra-cmake-modules ];
-  propagatedBuildInputs = [
-    kbookmarks kcompletion kconfig kconfigwidgets ki18n kio kiconthemes
-    knewstuff knotifications kpackage kwidgetsaddons libXcursor qtx11extras
+  buildInputs = [
+    kbookmarks kcompletion kconfig ki18n kio knewstuff knotifications kpackage
+    kwidgetsaddons libXcursor qtx11extras
   ];
+  propagatedBuildInputs = [ kconfigwidgets kiconthemes ];
 }