Add mpv configs

I'm surprised this was never here before. Oh well, gives me an excuse to
clean these up and comment them too.

.config/mpv/input.conf

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+# Mouse wheel volume
+WHEEL_UP      add volume 5
+WHEEL_DOWN    add volume -5
+
+# Arrow keys seek
+RIGHT seek  5
+LEFT  seek -5
+UP    seek  60
+DOWN  seek -60
+
+# The three controls I care about :)
+Q quit
+F cycle fullscreen
+S screenshot
+
+# If I leave a video on and go to bed, this dims the video feed significantly
+n set brightness -40;set gamma -40;show-text "Night Mode On"
+N set brightness 0;set gamma 0;show-text "Night Mode Off"

.config/mpv/mpv.conf

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+# I like normalizing at 100% volume and going up from there
+# 1000% is excessive but at least I'll never cap out
+volume-max=1000
+
+# My mpv usage is either on-disk media, or streamlink which does its own
+# caching, so we don't need to double cache.
+cache=no
+cache-pause=no
+demuxer-readahead-secs=1
+
+# Audio filter to try to normalize audio levels. Especially important for
+# Twitch where there's no defacto normal level to target
+af="dynaudnorm=g=5:f=250:r=0.9:p=0.5"
+
+# Put screenshots in my bespoke screenshot dir
+screenshot-directory=~/screenshot