vte290 is not needed anymore everything uses vte3 instead

Remove ${PORTSDIR}/ from dependencies, categories v, w, x, y, and z.

With hat:	portmgr
Sponsored by:	Absolight

Drop 8 support.

With hat:	portmgr
Sponsored by:	Absolight
Differential Revision:	https://reviews.freebsd.org/D3694

- Switch to options helpers
- Drop 8.x support

Approved by:	portmgr blanket

Part 1 of adding USE_GNOME=intltool to ports that require it.

The reason for this is that in the GNOME 3.16 update, USE_GNOME gtk20 and
gtk30 don't pull intltool in anymore.

PR:		201980
Exp-run by:	antoine@

MASTER_SITES cleanup.

- Replace ${MASTER_SITE_FOO} with FOO.
- Merge MASTER_SITE_SUBDIR into MASTER_SITES when possible. (This means 99.9%
  of the time.)
- Remove occurrences of MASTER_SITE_LOCAL when no subdirectory was present and
  no hint of what it should be was present.
- Fix some logic.
- And generally, make things more simple and easy to understand.

While there, add magic values to the FESTIVAL, GENTOO, GIMP, GNUPG, QT and
SAMBA macros.

Also, replace some EXTRACT_SUFX occurences with USES=tar:*.

Checked by:	make fetch-urlall-list
With hat:	portmgr
Sponsored by:	Absolight

Add portscout macro to igore these ports in the version checker, these
ports hold older version.

- Drop @dirrm* from and add empty directories to pkg-plists

Approved by:	portmgr blanket, kwm (for gnome@ ports)

Readd vte3 0.34.7 as vte290. There are still some programs that need the
older 2.90 API. Since the vte3 got updated to 0.38 which has the 2.91 API.