use C99 struct initializers

The old struct initializers are error prone and don't allow moving
elements around.  Since we are going to overhaul some of the APIs
soon, it's easier to have all implementations use C99 initializers.

src/audioOutputs/audioOutput_alsa.c

@@ -406,15 +406,14 @@ static int alsa_playAudio(void *data, const char *playChunk, size_t size)
 }
 
 const struct audio_output_plugin alsaPlugin = {
-	"alsa",
-	alsa_testDefault,
-	alsa_initDriver,
-	alsa_finishDriver,
-	alsa_openDevice,
-	alsa_playAudio,
-	alsa_dropBufferedAudio,
-	alsa_closeDevice,
-	NULL,	/* sendMetadataFunc */
+	.name = "alsa",
+	.test_default_device = alsa_testDefault,
+	.init = alsa_initDriver,
+	.finish = alsa_finishDriver,
+	.open = alsa_openDevice,
+	.play = alsa_playAudio,
+	.cancel = alsa_dropBufferedAudio,
+	.close = alsa_closeDevice,
 };
 
 #else /* HAVE ALSA */

src/audioOutputs/audioOutput_ao.c

@@ -238,15 +238,13 @@ static int audioOutputAo_play(void *data, const char *playChunk, size_t size)
 }
 
 const struct audio_output_plugin aoPlugin = {
-	"ao",
-	NULL,
-	audioOutputAo_initDriver,
-	audioOutputAo_finishDriver,
-	audioOutputAo_openDevice,
-	audioOutputAo_play,
-	audioOutputAo_dropBufferedAudio,
-	audioOutputAo_closeDevice,
-	NULL,	/* sendMetadataFunc */
+	.name = "ao",
+	.init = audioOutputAo_initDriver,
+	.finish = audioOutputAo_finishDriver,
+	.open = audioOutputAo_openDevice,
+	.play = audioOutputAo_play,
+	.cancel = audioOutputAo_dropBufferedAudio,
+	.close = audioOutputAo_closeDevice,
 };
 
 #else

src/audioOutputs/audioOutput_fifo.c

@@ -270,15 +270,13 @@ static int fifo_playAudio(void *data,
 }
 
 const struct audio_output_plugin fifoPlugin = {
-	"fifo",
-	NULL, /* testDefaultDeviceFunc */
-	fifo_initDriver,
-	fifo_finishDriver,
-	fifo_openDevice,
-	fifo_playAudio,
-	fifo_dropBufferedAudio,
-	fifo_closeDevice,
-	NULL, /* sendMetadataFunc */
+	.name = "fifo",
+	.init = fifo_initDriver,
+	.finish = fifo_finishDriver,
+	.open = fifo_openDevice,
+	.play = fifo_playAudio,
+	.cancel = fifo_dropBufferedAudio,
+	.close = fifo_closeDevice,
 };
 
 #else /* HAVE_FIFO */

src/audioOutputs/audioOutput_jack.c

@@ -435,15 +435,14 @@ static int jack_playAudio(void *data,
 }
 
 const struct audio_output_plugin jackPlugin = {
-	"jack",
-	jack_testDefault,
-	jack_initDriver,
-	jack_finishDriver,
-	jack_openDevice,
-	jack_playAudio,
-	jack_dropBufferedAudio,
-	jack_closeDevice,
-	NULL,	/* sendMetadataFunc */
+	.name = "jack",
+	.test_default_device = jack_testDefault,
+	.init = jack_initDriver,
+	.finish = jack_finishDriver,
+	.open = jack_openDevice,
+	.play = jack_playAudio,
+	.cancel = jack_dropBufferedAudio,
+	.close = jack_closeDevice,
 };
 
 #else /* HAVE JACK */

src/audioOutputs/audioOutput_mvp.c

@@ -257,15 +257,14 @@ static int mvp_playAudio(struct audio_output *audioOutput,
 }
 
 const struct audio_output_plugin mvpPlugin = {
-	"mvp",
-	mvp_testDefault,
-	mvp_initDriver,
-	mvp_finishDriver,
-	mvp_openDevice,
-	mvp_playAudio,
-	mvp_dropBufferedAudio,
-	mvp_closeDevice,
-	NULL,	/* sendMetadataFunc */
+	.name = "mvp",
+	.test_default_device = mvp_testDefault,
+	.init = mvp_initDriver,
+	.finish = mvp_finishDriver,
+	.open = mvp_openDevice,
+	.play = mvp_playAudio,
+	.cancel = mvp_dropBufferedAudio,
+	.close = mvp_closeDevice,
 };
 
 #else /* HAVE_MVP */

src/audioOutputs/audioOutput_null.c

@@ -76,13 +76,10 @@ static void null_dropBufferedAudio(void *data)
 }
 
 const struct audio_output_plugin nullPlugin = {
-	"null",
-	NULL,
-	null_initDriver,
-	NULL,
-	null_openDevice,
-	null_playAudio,
-	null_dropBufferedAudio,
-	null_closeDevice,
-	NULL,
+	.name = "null",
+	.init = null_initDriver,
+	.open = null_openDevice,
+	.play = null_playAudio,
+	.cancel = null_dropBufferedAudio,
+	.close = null_closeDevice,
 };

src/audioOutputs/audioOutput_oss.c

@@ -544,15 +544,14 @@ static int oss_playAudio(void *data,
 }
 
 const struct audio_output_plugin ossPlugin = {
-	"oss",
-	oss_testDefault,
-	oss_initDriver,
-	oss_finishDriver,
-	oss_openDevice,
-	oss_playAudio,
-	oss_dropBufferedAudio,
-	oss_closeDevice,
-	NULL,	/* sendMetadataFunc */
+	.name = "oss",
+	.test_default_device = oss_testDefault,
+	.init = oss_initDriver,
+	.finish = oss_finishDriver,
+	.open = oss_openDevice,
+	.play = oss_playAudio,
+	.cancel = oss_dropBufferedAudio,
+	.close = oss_closeDevice,
 };
 
 #else /* HAVE OSS */

src/audioOutputs/audioOutput_osx.c

@@ -353,15 +353,14 @@ static int osx_play(struct audio_output *audioOutput,
 }
 
 const struct audio_output_plugin osxPlugin = {
-	"osx",
-	osx_testDefault,
-	osx_initDriver,
-	osx_finishDriver,
-	osx_openDevice,
-	osx_play,
-	osx_dropBufferedAudio,
-	osx_closeDevice,
-	NULL,	/* sendMetadataFunc */
+	.name = "osx",
+	.test_default_device = osx_testDefault,
+	.init = osx_initDriver,
+	.finish = osx_finishDriver,
+	.open = osx_openDevice,
+	.play = osx_play,
+	.cancel = osx_dropBufferedAudio,
+	.close = osx_closeDevice,
 };
 
 #else

src/audioOutputs/audioOutput_pulse.c

@@ -204,15 +204,14 @@ static int pulse_playAudio(void *data,
 }
 
 const struct audio_output_plugin pulsePlugin = {
-	"pulse",
-	pulse_testDefault,
-	pulse_initDriver,
-	pulse_finishDriver,
-	pulse_openDevice,
-	pulse_playAudio,
-	pulse_dropBufferedAudio,
-	pulse_closeDevice,
-	NULL,	/* sendMetadataFunc */
+	.name = "pulse",
+	.test_default_device = pulse_testDefault,
+	.init = pulse_initDriver,
+	.finish = pulse_finishDriver,
+	.open = pulse_openDevice,
+	.play = pulse_playAudio,
+	.cancel = pulse_dropBufferedAudio,
+	.close = pulse_closeDevice,
 };
 
 #else /* HAVE_PULSE */

src/audioOutputs/audioOutput_shout.c

@@ -534,15 +534,14 @@ static void my_shout_set_tag(void *data,
 }
 
 const struct audio_output_plugin shoutPlugin = {
-	"shout",
-	NULL,
-	my_shout_init_driver,
-	my_shout_finish_driver,
-	my_shout_open_device,
-	my_shout_play,
-	my_shout_drop_buffered_audio,
-	my_shout_close_device,
-	my_shout_set_tag,
+	.name = "shout",
+	.init = my_shout_init_driver,
+	.finish = my_shout_finish_driver,
+	.open = my_shout_open_device,
+	.play = my_shout_play,
+	.cancel = my_shout_drop_buffered_audio,
+	.close = my_shout_close_device,
+	.send_tag = my_shout_set_tag,
 };
 
 #else