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/ktextwidgets.nix

@@ -1,14 +1,16 @@
-{ mkDerivation, lib, extra-cmake-modules, kcompletion, kconfig
-, kconfigwidgets, ki18n, kiconthemes, kservice, kwindowsystem
-, sonnet
+{
+  mkDerivation, lib,
+  extra-cmake-modules,
+  kcompletion, kconfig, kconfigwidgets, ki18n, kiconthemes, kservice,
+  kwindowsystem, qtbase, sonnet,
 }:
 
 mkDerivation {
   name = "ktextwidgets";
   meta = { maintainers = [ lib.maintainers.ttuegel ]; };
   nativeBuildInputs = [ extra-cmake-modules ];
-  propagatedBuildInputs = [
-    kcompletion kconfig kconfigwidgets ki18n kiconthemes kservice kwindowsystem
-    sonnet
+  buildInputs = [
+    kcompletion kconfig kconfigwidgets kiconthemes kservice kwindowsystem
   ];
+  propagatedBuildInputs = [ ki18n qtbase sonnet ];
 }