Add a (currently broken) implementation of the Sensation 1 onboard audio

OPL3 is working, Windows 3.1 driver initializes correctly but the DAC fails to play back properly: only one set of samples plays back with silence after reloading the sample counter

src/include/86box/sound.h

@@ -250,6 +250,9 @@ extern const device_t pssj_1e0_device;
 /* Tandy PSG */
 extern const device_t tndy_device;
 
+/* Tandy Sensation */
+extern const device_t sensationaud_device;
+
 /* Windows Sound System */
 extern const device_t wss_device;
 extern const device_t ncr_business_audio_device;

src/machine/m_at_socket1.c

@@ -392,6 +392,7 @@ machine_at_sensation1_init(const machine_t *model)
     device_add(&vl82c113_device);
 
     device_add(&pssj_1e0_device);
+    device_add(&sensationaud_device);
 
     if (fdc_current[0] == FDC_INTERNAL)
         device_add(&fdc_at_nsc_dp8473_device);

src/sound/CMakeLists.txt

@@ -52,6 +52,7 @@ add_library(snd OBJECT
     snd_ym7128.c
     snd_optimc.c
     snd_opl_esfm.c
+    snd_sensation.c
     snd_ymf701.c
     snd_ymf71x.c
     sound_util.c