math/gnuplot-tex-extras: Remove commented texmf

After 6 months of commit there were no comments from the maintainer or
any bugs reported about the removal of texmf which means this port
does not use texmf at all.

Sponsored by:	Nepustil
Approved by:    portmgr (blanket)

*/tex*: Update version 20210325=>20230313

- devel/tex-kpathsea: Update version 6.3.3=>6.3.5
- print/texlive-tlmgr: Update version 20210325=>20230313
  * Add LICENSE GPLv2
- devel/tex-libtexlua: Update distinfo from 20230313 dists
- devel/tex-libtexluajit: Update distinfo from 20230313 dists
- print/tex-ptexenc: Update version 1.3.9=>1.4.3
  * Pet portclippy
- devel/tex-web2c: Update version 20210325=>20230313
- devel/tex-synctex: Update distinfo from 20230313 dists
- print/tex-basic-engines: Update version 20210325=>20230313
- print/texlive-base: Update version 20210325=>20230313
- print/texlive-docs: Update version 20210325=>20230313
- print/texlive-full: Update version 20210325=>20230313

Mk/**tex.mk: Convert bsd.tex.mk to USES=tex

- Update all the consumers to use USES=tex
- USE_TEX=yes is the old way of writing USES=tex which has been removed
  and replaced in all ports
- Almost all of the USE_TEX features remains unchanged
- Some consumers had the same variables defined both in the mk
  infrastructure and also in the ports which have been removed from the
  ports as those are redundant.

In case any of the consumers are failing to build please make sure that
the nexessary USES=tex is there. Unlike previous USE_TEX=yes will no
longer load the required VARS for tex and related dependencies.

Reviewed by:	portmgr
Approved by:	portmgr (blanket)

Remove WWW entries moved into port Makefiles

Commit b7f05445c00f has added WWW entries to port Makefiles based on
WWW: lines in pkg-descr files.

This commit removes the WWW: lines of moved-over URLs from these
pkg-descr files.

Approved by:		portmgr (tcberner)

Add WWW entries to port Makefiles

It has been common practice to have one or more URLs at the end of the
ports' pkg-descr files, one per line and prefixed with "WWW:". These
URLs should point at a project website or other relevant resources.

Access to these URLs required processing of the pkg-descr files, and
they have often become stale over time. If more than one such URL was
present in a pkg-descr file, only the first one was tarnsfered into
the port INDEX, but for many ports only the last line did contain the
port specific URL to further information.

There have been several proposals to make a project URL available as
a macro in the ports' Makefiles, over time.

math/gnuplot-tex-extras: Add CPE information

Approved by:	portmgr (blanket)

One more small cleanup, forgotten yesterday.
Reported by:	lwhsu

Remove # $FreeBSD$ from Makefiles.

Update to 5.2.8

. Update to 5.2.7

. Update to 5.2.6

. Update to 5.2.5

. Update to 5.2.4.

. Update to 5.2.3.

- Fix trailing whitespace in pkg-descrs, categories [g-n]*

Approved by:	portmgr blanket

Remove ${PORTSDIR}/ from dependencies, categories m, n, o, and p.

With hat:	portmgr
Sponsored by:	Absolight

- Separate TeX style files from math/gnuplot into math/gnuplot-tex-extras
  to eliminate huge TeXLive dependency.  Note that TeX terminal support is
  still enabled by default because it works without them.

- Add Lua dependency to support TeX/Tikz terminal.

Approved by:	glewis (maintainer)