[spotify] Trigger scan after retrieving a valid access token from the

webinterface

Library now offers the function "library_exec_async". This allows
library sources to offer functions that will be executed in
the library thread. Useful to allow partial scans of only one source.

src/library.h

@@ -23,6 +23,7 @@
 #include <stdio.h>
 #include <time.h>
 
+#include "commands.h"
 #include "db.h"
 
 /*
@@ -88,6 +89,9 @@ library_set_scanning(bool is_scanning);
 bool
 library_is_exiting();
 
+int
+library_exec_async(command_function func, void *arg);
+
 int
 library_init();