first step of the big refactoring ("tree" branch).

From here on, we can track changes. It made no sense to put the
development up to this point into git.

include/ipc.h

@@ -13,6 +13,12 @@
 #define _IPC_H
 
 #include <ev.h>
+#include <stdbool.h>
+#include <yajl/yajl_gen.h>
+#include <yajl/yajl_parse.h>
+
+#include "data.h"
+#include "tree.h"
 
 #include "i3/ipc.h"
 
@@ -74,4 +80,6 @@ void ipc_send_event(const char *event, uint32_t message_type, const char *payloa
  */
 void ipc_shutdown();
 
+void dump_node(yajl_gen gen, Con *con, bool inplace_restart);
+
 #endif