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.

audio: remove 'Created by' lines

A big Thank You to the original contributors of these ports:

  *  <dmagda+libsamplerate@ee.ryerson.ca>
  *  <trasz@FreeBSD.org>
  *  Adam Weinberger
  *  Adam Weinberger <adamw@FreeBSD.org>
  *  Akinori MUSHA aka knu <knu@idaemons.org>
  *  Aleksander Fafula <alex@bsdguru.org>
  *  Alex Allan <alex@kamaz.org.uk>
  *  Alexander Botero-Lowry <alex@foxybanana.com>
  *  Alexander Kojevnikov <alexander@kojevnikov.com>
  *  Alexander Nedotsukov <bland@FreeBSD.org>
  *  Alexander Vereeken <Alexander88207@protonmail.com>

framework: convert bsd.gstreamer.mk to Uses/gstreamer.mk

- convert bsd.gstreamer.mk to Uses/gstreamer.mk
- convert ports tree to make use of USES=gstreamer
- remove duplicate dependency lines from the tree

Differential Revision: https://reviews.freebsd.org/D35097

all: Remove all other $FreeBSD keywords.

Remove # $FreeBSD$ from Makefiles.

pianod2 depends on gstreamer1 not gstreamer

Multiple ports: improve regex compliance

These changes largely fall into just two categories:

1. Need textproc/gsed for GNU extensions
2. Extraneous escapes that can go away

For #1, there's a further subdivision into those that require autoconf magic
and those that can get away with BINARY_ALIAS=sed=${LOCALBASE}/bin/gsed.
-CURRENT will soon gain GNU extensions, but these will take longer to get to
all supported releases; we must switch them to gsed to ensure we're actually
properly building them as intended.

For #2, I've fixed these as I can and we should upstream these fixes.

audio/pianod2: update to version 329

Bump PORTREVISION for devel/json-c json-c

audio/pianod2: update to version 309

audio/pianod2: update to 307

audio/pianod2: update to version 306

multimedia/ffmpeg: update to 4.2

Changes:	https://git.ffmpeg.org/gitweb/ffmpeg.git/blob/n4.2:/Changelog
ABI:		https://abi-laboratory.pro/tracker/timeline/ffmpeg/

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

Mark BROKEN on i386

xmlio.cpp:97:6: error: redefinition of 'append_attribute'
void append_attribute (rapidxml::xml_document<> &doc,
     ^
xmlio.cpp:82:6: note: previous definition is here
void append_attribute (rapidxml::xml_document<> &doc,
     ^
xmlio.cpp:103:6: error: redefinition of 'retrieve_attribute'
bool retrieve_attribute (const rapidxml::xml_node<> *node, const char *name,
time_t &answer) {
     ^
xmlio.cpp:88:6: note: previous definition is here
bool retrieve_attribute (const rapidxml::xml_node<> *node, const char *name, int
&answer) {
     ^

Reported by:	pkg-fallout
MFH:		2019Q3

[New port] audio/pianod2: A free, multi-source, network-controlled music player
daemon

Approved by:	araujo
Differential Revision:	https://reviews.freebsd.org/D19042