[mpv] Add low/high quality profiles

Added profiles for lq and hq playback in preparation for battery mode
setting.

Removed qutebrowser forcing ytdl options, since it is set in mpv.conf.

mpv/.config/mpv/mpv.conf

@@ -125,7 +125,7 @@ force-window=immediate
 cache=yes
 # create a huge cache to buffer most of videos
 demuxer-max-bytes=3000MiB
-demuxer-readahead-sec=500
+demuxer-readahead-secs=500
 
 [protocol.http]
 profile=network
@@ -143,3 +143,16 @@ loop-file=yes
 # for those yt playlists that are created in reverse order
 [reverse]
 ytdl-raw-options=playlist-reverse=
+
+[lowquality]
+scale=bilinear
+cscale=ewa_lanczossharp
+video-sync=audio
+interpolation=no
+
+[highquality]
+scale=ewa_lanczossharp
+cscale=ewa_lanczossharp
+video-sync=display-resample
+interpolation=yes
+tscale=oversample