audio_core: dsp_hle: add Media Foundation decoder...

* appveyor: switch to Media Foundation API
* Travis CI MinGW build needs an update with the container image

src/audio_core/hle/adts.h

@@ -0,0 +1,31 @@
+#pragma once
+#ifndef ADTS_ADT
+#define ADTS_ADT
+
+#include <stdbool.h>
+#include <stdint.h>
+#include <string.h>
+
+struct ADTSData {
+    bool MPEG2;
+    uint8_t profile;
+    uint8_t channels;
+    uint8_t channel_idx;
+    uint8_t framecount;
+    uint8_t samplerate_idx;
+    uint32_t length;
+    uint32_t samplerate;
+};
+
+typedef struct ADTSData ADTSData;
+
+#ifdef __cplusplus
+extern "C" {
+#endif // __cplusplus
+uint32_t parse_adts(char* buffer, struct ADTSData* out);
+// last two bytes of MF AAC decoder user data
+uint16_t mf_get_aac_tag(struct ADTSData input);
+#ifdef __cplusplus
+}
+#endif // __cplusplus
+#endif // ADTS_ADT