cleanup: Remove expired ports:

2022-06-30 multimedia/mpeg2codec: Obsolete, please consider using
multimedia/ffmpeg
2022-06-30 multimedia/livestreamer: Abandoned upstream, please consider using
www/yt-dlp or multimedia/streamlink
2022-06-30 net/kissd: Obsolete, target hardware was released 19 years ago
2022-06-30 www/gecko-mediaplayer: Uses incompatible plugin interface NPAPI
2022-06-30 multimedia/snappy: Deprecated upstream, please consider
multimedia/mpv or multimedia/vlc
2022-06-30 audio/exaile: Requires py-bsddb3 which requires upstream EOLd db5
2022-06-30 multimedia/gnome-twitch: Unmaintained, please consider using
www/yt-dlp or multimedia/streamlink
2022-06-30 multimedia/clive: Last release in 2012, please consider using
www/yt-dlp or multimedia/streamlink
2022-06-30 multimedia/imagination: Obsolete, majority of DVD players made in the
last 15+ years have been able to do image slideshows
2022-06-30 multimedia/m2tstoavi: Marked obsolete by upstream in 2010, please
consider using multimedia/ffmpeg or multimedia/handbrake
2022-06-30 multimedia/mps-youtube: Abandoned upstream
2022-06-30 multimedia/umph: Last release in 2012 and abandoned upstream, please
consider using www/yt-dlp
2022-06-30 multimedia/quvi09: Deprecated upstream, please consider using
www/yt-dlp or multimedia/streamlink

multimedia/gstreamer: add missing USES=gstreamer

Add missing USES=gstreamer to options not caught in gstreamer.mk conversion in
[1]

Reported by:	fluffy

[1]  ca3f925d6eb53ff27e2a49775f6d33f52a587ae4

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

multimedia/gnome-twitch: Mark BROKEN, deprecate and set expiration date to
2022-06-30

Unmaintained and multiple bug reports upstream, we have at least two
ports in tree that are maintained upstream and offers similar
functionality (www/yt-dlp and multimedia/streamlink)

PR:		263513
Approved by:	Greg V <greg@unrelenting.technology> (maintainer)

INSTALLS_ICONS: retire the macro and rework the related dependencies

While here, make sure gtk-update-icon-cache is only on run dependency
where added as a dependency
Enforce gtk3 to depend on gtk-update-icon-cache (previously it was
inheriting the dependency)

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

Remove # $FreeBSD$ from Makefiles.

multimedia/mpv: update to 0.30.0

ABI is compatible but rebuild consumers anyway in case some can take
advantage of new APIs e.g.,
https://github.com/mpv-player/mpv/commit/e08f235578aa

- DVDREAD is no longer supported after
https://github.com/mpv-player/mpv/commit/622940498525
- DVDNAV needs libdvdred after
https://github.com/mpv-player/mpv/commit/34e6a26f4d5a
- TEST needs newer dependency after
https://github.com/mpv-player/mpv/commit/293dfc782552
- V4L can no longer use tv:// after
https://github.com/mpv-player/mpv/commit/b30e85508a30
- VULKAN option uses libplacebo after
https://github.com/mpv-player/mpv/commit/7006d6752d7d
- ZIMG to support --vf=fingerprint after
https://github.com/mpv-player/mpv/commit/9cfeafa89e2e
- ZSH option is no longer needed after
https://github.com/mpv-player/mpv/commit/2712db823884
- Drop --disable-vapoursynth-lazy after
https://github.com/mpv-player/mpv/commit/fb8d240c4d04
- Add --disable-shaderc to avoid no longer used dependency brought via
libplacebo

Changes:	https://github.com/mpv-player/mpv/releases/tag/v0.30.0

Add USES=xorg USES=gl, ports categories m

Add USES=xorg and USES=gl to ports in categories starting with 'm'
While here, try to sprinkle other USES (mostly gnome and sdl) as needed.

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

multimedia/gnome-twitch: update to new snapshot

While here, clean up

PR:		238005
Submitted by:	Greg V <greg@unrelenting.technology> (maintainer)

New port: multimedia/gnome-twitch

GTK based player for Twitch.tv online live video streams.

WWW: http://gnome-twitch.vinszent.com

PR:		224980
Submitted by:	greg@unrelenting.technology
Reviewed by:	yuri (earlier version)