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/kdesignerplugin.nix

@@ -2,15 +2,15 @@
   mkDerivation, lib,
   extra-cmake-modules, kdoctools,
   kcompletion, kconfig, kconfigwidgets, kcoreaddons, kiconthemes, kio,
-  kitemviews, kplotting, ktextwidgets, kwidgetsaddons, kxmlgui, sonnet
+  kitemviews, kplotting, ktextwidgets, kwidgetsaddons, kxmlgui, qttools, sonnet,
 }:
 
 mkDerivation {
   name = "kdesignerplugin";
   meta = { maintainers = [ lib.maintainers.ttuegel ]; };
   nativeBuildInputs = [ extra-cmake-modules kdoctools ];
-  propagatedBuildInputs = [
-    kcompletion kconfig kconfigwidgets kcoreaddons kiconthemes kio
-    kitemviews kplotting ktextwidgets kwidgetsaddons kxmlgui sonnet
+  buildInputs = [
+    kcompletion kconfig kconfigwidgets kcoreaddons kiconthemes kio kitemviews
+    kplotting ktextwidgets kwidgetsaddons kxmlgui qttools sonnet
   ];
 }