Get rid of gnome2 package set

[jtojnar]

There is gnome2 package set under desktops but we do not really have GNOME 2 desktop packaged – it just contains various outdated libraries. We should try to remove as much as we can and merge the rest into main namespace.

Generated with the folloeing git grep -l GConf

• nixos/modules/services/x11/window-managers/metacity.nix
• pkgs/applications/audio/google-play-music-desktop-player/default.nix
• pkgs/applications/audio/paprefs/default.nix – https://bugs.freedesktop.org/show_bug.cgi?id=57743
• pkgs/applications/audio/spotify/default.nix
• pkgs/applications/editors/android-studio/common.nix android-studio: remove gnome_vfs & GConf #322831
• pkgs/applications/editors/android-studio/default.nix
• pkgs/applications/editors/typora/default.nix
• pkgs/applications/graphics/pencil/default.nix
• pkgs/applications/misc/airtame/default.nix
• pkgs/applications/misc/gxneur/default.nix – gxneur: Depends on gconf AndrewCrewKuznetsov/xneur-devel#27
• pkgs/applications/misc/hyper/default.nix
• pkgs/applications/misc/terminus/default.nix
• pkgs/applications/misc/tomboy/default.nix
• pkgs/applications/networking/browsers/chromium/common.nix
• pkgs/applications/networking/browsers/opera/default.nix
• pkgs/applications/networking/instant-messengers/discord/default.nix
• pkgs/applications/networking/instant-messengers/franz/default.nix
• pkgs/applications/networking/instant-messengers/messenger-for-desktop/default.nix
• pkgs/applications/networking/instant-messengers/signal-desktop/beta.nix
• pkgs/applications/networking/instant-messengers/signal-desktop/default.nix
• pkgs/applications/networking/instant-messengers/skypeforlinux/default.nix
• pkgs/applications/networking/instant-messengers/slack/default.nix
• pkgs/applications/networking/instant-messengers/stride/default.nix
• pkgs/applications/networking/instant-messengers/wire-desktop/default.nix
• pkgs/applications/networking/mailreaders/inboxer/default.nix
• pkgs/applications/networking/mailreaders/nylas-mail-bin/default.nix
• pkgs/applications/office/libreoffice/default.nix - libreoffice-fresh: 6.3.0.4 -> 6.3.2.1 #68414
• pkgs/applications/office/libreoffice/still.nix
• pkgs/applications/office/planner/default.nix
• pkgs/applications/version-management/gitkraken/default.nix
• pkgs/applications/video/coriander/default.nix Remove some gnome2 dependents #322986
• pkgs/applications/video/webtorrent_desktop/default.nix
• pkgs/applications/window-managers/xmonad/log-applet/default.nix
• pkgs/desktops/gnome-2/bindings/gnome-python/default.nix
• pkgs/desktops/gnome-2/default.nix
• pkgs/desktops/gnome-2/desktop/gnome-control-center/default.nix
• pkgs/desktops/gnome-2/desktop/gnome-desktop/default.nix
• pkgs/desktops/gnome-2/desktop/gnome-keyring/default.nix
• pkgs/desktops/gnome-2/desktop/gnome-panel/default.nix
• pkgs/desktops/gnome-2/desktop/gnome-settings-daemon/default.nix
• pkgs/desktops/gnome-2/desktop/libgnomekbd/default.nix
• pkgs/desktops/gnome-2/desktop/libgweather/default.nix
• pkgs/desktops/gnome-2/desktop/mail-notification/default.nix
• pkgs/desktops/gnome-2/desktop/metacity/default.nix
• pkgs/desktops/gnome-2/platform/GConf/default.nix
• pkgs/desktops/gnome-2/platform/at-spi/default.nix
• pkgs/desktops/gnome-2/platform/gconfmm/default.nix
• pkgs/desktops/gnome-2/platform/gnome-vfs/default.nix gnome2.gnome_vfs: remove #322862
• pkgs/desktops/gnome-2/platform/gtkhtml/4.x.nix
• pkgs/desktops/gnome-2/platform/gtkhtml/default.nix
• pkgs/desktops/gnome-2/platform/libbonoboui/default.nix gnome2.gnome_vfs: remove #322862
• pkgs/desktops/gnome-2/platform/libgnome/default.nix gnome2.gnome_vfs: remove #322862
• pkgs/desktops/gnome-2/platform/libgnomeui/default.nix gnome2.gnome_vfs: remove #322862
• pkgs/desktops/gnome-3/core/gconf/default.nix
• pkgs/desktops/gnome-3/devtools/nemiver/safe_ptr.patch
• pkgs/development/compilers/openjdk/10.nix Help: Bisq, openjdk, libcrypto and gnome2 deps #73246
• pkgs/development/compilers/openjdk/8.nix openjdk: remove gnome_vfs & GConf #322599
• pkgs/development/haskell-modules/hackage-packages.nix
• pkgs/development/libraries/geoclue/default.nix – Drop geoclue1 & geoclue2: 2.4.8 → 2.4.10 #43868
• pkgs/development/libraries/gtk-sharp/2.0.nix
• pkgs/development/libraries/gtk-sharp/3.0.nix
• pkgs/development/libraries/libgksu/default.nix
• pkgs/development/libraries/qt-4.x/4.8/default.nix – Qt4 deprecation tracking issue #33248
• pkgs/development/libraries/qt-4.x/4.8/dlopen-gtkstyle.diff
• pkgs/development/libraries/wxwidgets/wxGTK28.nix
• pkgs/development/libraries/wxwidgets/wxGTK29.nix
• pkgs/development/libraries/wxwidgets/wxGTK30.nix
• pkgs/development/tools/react-native-debugger/default.nix
• pkgs/development/tools/unity3d/default.nix
• pkgs/development/web/insomnia/default.nix
• pkgs/development/web/postman/default.nix
• pkgs/games/gtetrinet/default.nix Remove some gnome2 dependents #322986
• pkgs/games/steam/fhsenv.nix
• pkgs/misc/emulators/mess/default.nix
• pkgs/tools/filesystems/relfs/default.nix
• pkgs/tools/misc/alarm-clock-applet/default.nix
• pkgs/tools/misc/staruml/default.nix
• pkgs/tools/misc/sweep-visualizer/default.nix
• pkgs/tools/security/keybase/gui.nix
• pkgs/top-level/all-packages.nix