cool-old-term: rename to cool-retro-term (close #6071)

The project has changed its name to cool-retro-term. The project also added a
dependency that is included as a submodule. I added this dependency as a
separate expression.

pkgs/development/libraries/qmltermwidget/default.nix

@@ -0,0 +1,33 @@
+{ stdenv, fetchgit, qt5 }:
+
+stdenv.mkDerivation rec {
+  version = "0.1.0";
+  name = "qmltermwidget-${version}";
+
+  src = fetchgit {
+    url = "https://github.com/Swordfish90/qmltermwidget.git";
+    rev = "refs/tags/v${version}";
+    sha256 = "19pz27jsdpa3pybj8sghmmd1zqgr73js1mp3875rhx158dav37nz";
+  };
+
+  buildInputs = [ qt5 ];
+
+  patchPhase = ''
+    substituteInPlace qmltermwidget.pro \
+      --replace '$$[QT_INSTALL_QML]' "/lib/qml/"
+  '';
+
+  configurePhase = "qmake PREFIX=$out";
+
+  installPhase=''make INSTALL_ROOT="$out" install'';
+  
+  enableParallelBuilding = true;
+
+  meta = {
+    description = "This project is a QML port of qtermwidget";
+    homepage = "https://github.com/Swordifish90/qmltermwidget";
+    licenses = with stdenv.lib.licenses; [ gpl2 ];
+    platforms = stdenv.lib.platforms.linux;
+    maintainers = with stdenv.lib.maintainers; [ skeidel ];
+  };
+}