continuation of #109595
pkgconfig was aliased in 2018, however, it remained in
all-packages.nix due to its wide usage. This cleans
up the remaining references to pkgs.pkgsconfig and
moves the entry to aliases.nix.
python3Packages.pkgconfig remained unchanged because
it's the canonical name of the upstream package
on pypi.
The notion (not-ion) window manager [1], plus optional (defaulted to
true) Xft/pango support (via [2]). Defined a license (notion uses a
modified LGPL).
As per [3], changes:
1. renamed option from pango -> xft, better to reflect the actual
nature of the patch;
2. modified the patch to replace the postPatch changes to system-autodeteck.mk;
3. commited the patch to the nixpkgs repo;
4. removed 'fallbackFont' as an option. Use a sensible default, instead.
Many stylistic changes, thanks to @lethalman.
[1] http://notion.sourceforge.net
[2] http://sourceforge.net/p/notion/feature-requests/47/
[3] https://github.com/NixOS/nixpkgs/pull/8789