MPV: improved A/V sync

- use displays refresh rate
- execute needs drawing with higher priority
- run create() with higher priority
- determine the number of threads used for rendering
- enable VSYNC and change video-sync  to display-resample
- iOS/tvOS: set new display refresh rate on change
- run setSize with higher priority
- add more options to MPVClient
- get refresh rate updates
- sync refresh rate to fps
- update CADisplayLink to current refresh rate
- update refresh rate on macOS
- Add experimental feature to sync display  with content fps

Signed-off-by: Toni Förster <toni.foerster@gmail.com>

Shared/Settings/AdvancedSettings.swift

@@ -11,6 +11,7 @@ struct AdvancedSettings: View {
     @Default(.mpvHWdec) private var mpvHWdec
     @Default(.mpvDemuxerLavfProbeInfo) private var mpvDemuxerLavfProbeInfo
     @Default(.mpvInitialAudioSync) private var mpvInitialAudioSync
+    @Default(.mpvSetRefreshToContentFPS) private var mpvSetRefreshToContentFPS
     @Default(.showCacheStatus) private var showCacheStatus
     @Default(.feedCacheSize) private var feedCacheSize
     @Default(.showPlayNowInBackendContextMenu) private var showPlayNowInBackendContextMenu
@@ -245,6 +246,12 @@ struct AdvancedSettings: View {
                 #endif
             }
 
+            Toggle(isOn: $mpvSetRefreshToContentFPS) {
+                HStack {
+                    Text("Sync refresh rate with content FPS – EXPERIMENTAL")
+                }
+            }
+
             if mpvEnableLogging {
                 logButton
             }