Make the movie player work somewhat.

THPs are *almost* just a bunch of JPEGs so the TL;DR is BE fixes and replacing the decoding with libjpeg-turbo.

Needs changes to thp.h which should be removed from Aurora, will do that later.

Also audio not implemented yet.

src/dusk/audio/DuskAudioSystem.cpp

@@ -111,6 +111,11 @@ int RenderNewAudioFrame() {
     outRaw.flush();
 #endif
 
+    if (JASDriver::extMixCallback != nullptr) {
+        // TODO: actually mix this data in.
+        JASDriver::extMixCallback(countSubframes * DSP_SUBFRAME_SIZE);
+    }
+
     return static_cast<u16>(countSubframes) * DSP_SUBFRAME_SIZE;
 }