Update multimedia/mpv to 0.18.0

Changes:
Release 0.18.0
==============
Build System Changes
--------------------
- build: Do not link to libGL for egl-drm
- build: also use the iconv check on FreeBSD
- build: don't install tests, only build them
- build: re-enable encoding mode by default
- vo_opengl: hwdec: remove build-dependency on dxva2 (#3150)
- wscript: make at least 1 OpenGL output mandatory

Features
--------
New
~~~
- csputils: add SMPTE ST2084 support
- demux_mkv: support Matroska webvtt (#3247)
- demux_playlist: read directories recursively
- stream_memory: add hex:// protocol
- vf_crop: support opaque hardware decoding formats
- vf_d3d11vpp: add a D3D11 video processor filter
- vo_opengl: D3D11VA + ANGLE interop
- vo_opengl: add an angle-es2 backend
- vo_opengl: angle: dynamically load ANGLE
- vo_opengl: d3d11egl: native NV12 sampling support
- vo_opengl: enable color management on GLES
- vo_opengl: implement HDR (SMPTE ST2084)
- vo_opengl: implement tone mapping algorithms
- vo_opengl: make PBOs work on GLES 3.x
- vo_opengl: support external user hooks, enhancing the flexibility of user shaders
- vo_opengl: vdpau interop without RGB conversion
- wayland: implement HIDPI support

Removed
~~~~~~~
- vo_opengl: remove nnedi3 prescaler (replaced by user shaders)
- vo_opengl: remove prescaling framework with superxbr prescaler (replaced by user shaders)

Options and Commands
--------------------
Added
~~~~~
- Windows: make taskbar progress indication optional (#2535)
- af_lavcac3enc: make encoder configurable
- command: add playlist-pos-1 property (#2828)
- command: introduce hwdec-current and hwdec-interop properties.
- options: add --fit-border video option (currently Windows only)
- video: add --hwdec=auto-copy mode
- vo_opengl: always autoselect ANGLE as backend if available
- vo_opengl: expose performance timers as properties
- x11: add --x11-bypass-compositor=never
- x11: extend --x11-bypass-compositor with fs-only option (#2582)

Changed
~~~~~~~
- command: allow setting panscan etc. properties if no video is active
- command: don't seek immediately when setting a-b loop while paused
- command: if only ab-loop-b is set, loop from start of file
- options: --geometry: center window position after applying size (#2397)
- player: loop on end of file if ab-loop-b is unset
- sd_add: replace --sub-ass=no with --ass-style-override=strip

Removed
~~~~~~~
- vo_opengl: remove non-working rgb/rgba FBO formats

Fixes and Minor Enhancements
----------------------------
- TOOLS/zsh.pl: add .f4v extension in zsh completions
- TOOLS/zsh.pl: complete --audio-device
- Windows: center window on original window center on resize to fit screen
- Windows: fix size calculations for window resize (#2935)
- Windows: fix wrong behavior with window-scale when window size exceeds screen size
- Windows: make VOCTRL_SET_UNFS_WINDOW_SIZE resize the window around its center (#3164)
- af_lavcac3enc: fix custom bitrates
- ao_alsa: add more workarounds for hardware with broken drivers (e.g. ODROID-C2)
- ao_opensles: remove 32-bit audio formats (not supported by Android)
- cocoa: fix actual display refresh rate retrieval
- cocoa: use displaylink without manually tracking the display id (#2392)
- command: improve playlist* properties change notifications (#3267)
- command: slightly nicer OSD list formatting
- compatibility with recent FFmpeg APIs
- d3d: fix hardware decoding of most MPEG2 things
- d3dva: move Intel_H264_NoFGT_ClearVideo to lower priority (#3059)
- demux_mkv: better resync behavior for broken google-created webms
- demux_mkv: fix seeking with files that miss the first index entry
- demux_playlist: recognize m3u8 as playlist extension (#3154)
- input: fix parsing multiple input command prefixes
- lcms: don't warn/error on 3dlut cache misses
- lcms: improve black point handling (especially BT.1886)
- macOS: handle multiple dropped files on the window (#3076)
- player: always show the first frame in DS mode
- player: assume video forwards timestamps jumps only with some formats (#3027)
- player: do not update OSD all the time when paused
- player: eagerly redraw OSD when seeking with coverart
- player: fix use-after-free with --screenshot-directory (#3049)
- player: force VO reconfig when unselecting video track
- player: really start audio only once video is ready
- sd_lavc: work around bug in older FFmpeg releases (#3109)
- stream_cdda: enable cache by default
- sub: fix --sub-gauss
- vd_lavc: better hwdec wrapper decoder selection
- vo_opengl: EGL: fix hwdec probing
- vo_opengl: angle: avoid fullscreen FBO copy for flipping
- vo_opengl: angle: enable DirectComposition (lowers vsync jitter)
- vo_opengl: angle: prevent DXGI hooking Alt+Enter
- vo_opengl: avoid outputting ultra-wide-gamut by default
- vo_opengl: correctly disable interpolation if tscale can't be used
- vo_opengl: fix bicubic_fast in ES mode
- vo_opengl: fix d3d11 hardware decoding probing on Windows 7
- vo_opengl: improve scale=oversample performance
- vo_opengl: make the screen blue on shader errors
- vo_opengl: partially fix 0bgr format support
- vo_opengl: possibly update icc profile after changing options
- vo_opengl: request core profile on X11/EGL too
- vo_opengl: require at least ES 3.0 for float textures
- vo_opengl: vdpau: fix certain cases of preemption recovery failures
- vo_rpi: attempt to survive display mode changes
- vo_rpi: fix destroying overlays (#3100)
- vo_rpi: wait for vsync with a timeout
- vo_sdl: fix pixel formats.
- vo_xv: Handle incorrect size returned by Xv(Shm)CreateImage (#320)
- wayland: correctly report display refresh rate
- wayland: use the advertised size in fullscreen (#3021, #2657)
- x11: tell GNOME to use dark window decorations
- ytdl_hook: fix brightcove urls
- ytdl_hook: just check if protocol is rtmp (#3090)
- ytdl_hook: support multi-arc subtitles

(leot)