Rework transport protocol

Remove the old PinosBuffer object and replace it with SpaControl, this
communication protocol is designed to make it possible to implement
remote nodes and so it is moved to Spa.
Move SpaBuffer into to API
Work on easier API to make formats, implement enumeration and support
for all formats in v4l2.
Improve format output in -inspect

spa/include/spa/debug.h

@@ -0,0 +1,38 @@
+/* Simple Plugin API
+ * Copyright (C) 2016 Wim Taymans <wim.taymans@gmail.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef __SPA_DEBUG_H__
+#define __SPA_DEBUG_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <spa/defs.h>
+#include <spa/port.h>
+
+SpaResult spa_debug_port_info (const SpaPortInfo *info);
+SpaResult spa_debug_dump_mem  (void *data, size_t size);
+
+#ifdef __cplusplus
+}  /* extern "C" */
+#endif
+
+
+#endif /* __SPA_DEBUG_H__ */