feat: ffmpeg hardware acceleration (#899)

* Bump threads to 4 (20-30% CPU Increase)
+ Add -hwaccel auto flag

app/src/main/kotlin/me/rhunk/snapenhance/download/FFMpegProcessor.kt

@@ -115,6 +115,7 @@ class FFMpegProcessor(
         // load ffmpeg native sync to avoid native crash
         synchronized(this) { FFmpegKit.listSessions() }
         val globalArguments = ArgumentList().apply {
+            this += "-hwaccel auto" //Use hwaccel If Available
             this += "-y"
             this += "-threads" to ffmpegOptions.threads.get().toString()
         }