In preparation of the update of glib remove the -reference ports

Those ports mainly concern old Gnome2 libraries, the behaviour of this infra
is not compatible with the meson build system (being used in newer version)
the documentation is provided otherwise in the other version

The FreeBSD GNOME team proudly presents GNOME 3.14 and Cinnamon 2.2.
Gnome 3.14.1 and Cinnamon 2.2.16 are supported on FreeBSD 9.3-RELEASE and up.

This commit removes the old GNOME 2 desktop, bindings and some ports that
can't be compiled. A few ports where updated to more recent versions to
allow them to compile with this update.

Apart from updating ports to newer versions

GDM is more integrated with gnome-shell now, and handles several things for
the GNOME desktop such as screen locking. If you want to use GNOME 3 via
startx, you will have to add your own lock screen/screensaver. For example
xscreensaver
can be used for sessions started without GDM.

Shell Extensions can be installed via https://extensions.gnome.org/ , we have

- Stage support for all -reference ports
- Nuke NOPORTDOCS, those ports are already IGNOREd with NOPORTDOCS

Approved by:	kwm (maintainer)

Add NO_STAGE all over the place in preparation for the staging support (cat:
x11-toolkits)

- Add header in these *-reference ports.
- Fix a few of pkg-descr by chase the rename.
- Move all PORTREVISION and PORTEPOCH to top with ?=.
- Put USE_X_PREFIX back in, but under REFERENCE_PORT, and remove PREFIX? and
  USE_XLIB. This fix ports to use the correct mtree when you change the prefix,
  for example:

        Incorrect: (Without USE_X_PREFIX)
        ================================
        # cd /usr/ports/x11-toolkits/gtk20
        # make -V MTREE_FILE
        /etc/mtree/BSD.x11-4.dist
        # make PREFIX=/tmp/foo -V MTREE_FILE
        /etc/mtree/BSD.local.dist <-- Here...
        ================================

- Add pkg-descr

Requested by:   Dan Langille <dan@langille.org> for freshports.org

Move the vte programming reference to the vte-reference port.