graphics/movit: Update to 1.7.1

- Take maintainership
- Add support for regression tests
- Simplify PORTDOCS install

*: Bump PORTREVISIONs for math/mpc update to 1.3.1

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.

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

Remove # $FreeBSD$ from Makefiles.

graphics/movit: Update to 1.6.3

Changes:
https://git.sesse.net/?p=movit;a=blob;f=NEWS;h=28c066c1f37bee6bc68b525741668dff05b0722f;hb=HEAD

- Upgrade math/eigen3 to 3.3.8;

- Add some dependencies which might be detected by Find_Package but not
registered;

- Bump PORTREVISION of consumers.

PR:		250833
Submitted by:	/me
Approved by:	tcberner@ (KDE / maintainer) + exp-run

Bump PORTREVISION for ports depending on the canonical version of GCC
as defined in Mk/bsd.default-versions.mk which has moved from GCC 8.3
to GCC 9.1 under most circumstances now after revision 507371.

This includes ports
 - with USE_GCC=yes or USE_GCC=any,
 - with USES=fortran,
 - using Mk/bsd.octave.mk which in turn features USES=fortran, and
 - with USES=compiler specifying openmp, nestedfct, c11, c++0x, c++11-lang,
   c++11-lib, c++14-lang, c++17-lang, or gcc-c++11-lib
plus, everything INDEX-11 shows with a dependency on lang/gcc9 now.

PR:		238330

Update math/eigen3 to 3.3.7

- http://eigen.tuxfamily.org/index.php?title=ChangeLog#Eigen_3.3.6
- http://eigen.tuxfamily.org/index.php?title=ChangeLog#Eigen_3.3.7

USES=compiler:c++11-lang is needed to fix linking with multimedia/mlt.

PR:		233906
Submitted by:	Piotr Kubaj

Update multimedia/mlt, multimedia/shotcut and graphics/movit

- multimedia/mlt:       6.12.0
- multimedia/shotcut:   18.11.18
- graphics/movit:       1.6.2

To reduce the bumps, all in one.

PR:		229068
PR:		229071
Approved by:	multimedia (kwm)

Return avilla@'s ports to the pool after his commit bit got taken in for
safekeeping.

This needs eigen at runtime too.

Pointy hat:	tcberner
Sponsored by:	Absolight

New USES=eigen

  Usage:
    USES=eigen:<version>[,<type>]

    version: 2 or 3 (required)
    type:    build (default), run

  For example:
    USES=eigen:2,build,run
  will add a BUILD- and RUN_DEPENDS on math/eigen2, and
    USES=eigen:3
  will add a BUILD_DEPENDS on math/eigen3.

* Convert the existing ports to use it
  - biology/iqtree: remove run time dependency (seemed not to be needed)
  - graphics/movit: remove run time dependency (seemed not to be needed)
  - science/avogadro: add run time dependeny (installed cmake file requires it
to be present)

Reviewed by:	rakuco, mat
Differential Revision:	https://reviews.freebsd.org/D13702

Movit is the Modern Video Toolkit, notwithstanding that anything
that's called "modern" usually isn't, and it's really not a toolkit.

Movit aims to be a _high-quality_, _high-performance_, _open-source_
library for video filters.

WWW: https://movit.sesse.net