input: pass config_param to input_plugin.init()

Allow input plugins to configure with an "input" block in mpd.conf.
Also allow the user to disable a plugin completely.

src/input/archive_input_plugin.c

@@ -73,5 +73,6 @@ input_archive_open(struct input_stream *is, const char *pathname)
 }
 
 const struct input_plugin input_plugin_archive = {
+	.name = "archive",
 	.open = input_archive_open,
 };

src/input/curl_input_plugin.c

@@ -92,7 +92,7 @@ struct input_curl {
 static struct curl_slist *http_200_aliases;
 
 static bool
-input_curl_init(void)
+input_curl_init(G_GNUC_UNUSED const struct config_param *param)
 {
 	CURLcode code = curl_global_init(CURL_GLOBAL_ALL);
 	if (code != CURLE_OK) {
@@ -954,6 +954,7 @@ input_curl_open(struct input_stream *is, const char *url)
 }
 
 const struct input_plugin input_plugin_curl = {
+	.name = "curl",
 	.init = input_curl_init,
 	.finish = input_curl_finish,
 

src/input/file_input_plugin.c

@@ -121,6 +121,7 @@ input_file_eof(struct input_stream *is)
 }
 
 const struct input_plugin input_plugin_file = {
+	.name = "file",
 	.open = input_file_open,
 	.close = input_file_close,
 	.read = input_file_read,

src/input/mms_input_plugin.c

@@ -115,6 +115,7 @@ input_mms_seek(G_GNUC_UNUSED struct input_stream *is,
 }
 
 const struct input_plugin input_plugin_mms = {
+	.name = "mms",
 	.open = input_mms_open,
 	.close = input_mms_close,
 	.buffer = input_mms_buffer,