Tidy up mpv configs

- Turn off screensaver inhibition because it shanks *all* wayland idle detection
- Bump hardware decoding settings up to use gpu-next and safe codecs only

.config/mpv/mpv.conf

@@ -9,7 +9,8 @@ cache-pause=no
 demuxer-readahead-secs=1
 
 # Enable HW decoding. This should be safe on any system as failure falls back to SWDec
-hwdec=auto
+hwdec=auto-safe
+vo=gpu-next
 
 # Audio filter to try to normalize audio levels. Especially important for
 # Twitch where there's no defacto normal level to target
@@ -20,3 +21,7 @@ screenshot-directory=~/screenshot
 
 # Make images opened in mpv display until dismissed
 image-display-duration=inf
+
+# Suspending the "screensaver" actually completely kills Wayland's idle detection
+# which in turn breaks everything I use that relies on it
+stop-screensaver=no