Added an sql script with a debug-info-view for plugins

Author: Egil Moeller

contrib/scripts/plugin_info.sql

@@ -0,0 +1,14 @@
+create view plugin_info as
+ select
+  p.name as plugin,
+  h.name as hook,
+  ph.original_name,
+  ht.name as type
+ from
+  plugin as p
+  join plugin_hook as ph on
+   p.id = ph.plugin_id 
+  join hook as h on
+   ph.hook_id = h.id 
+  join hook_type as ht on
+   h.type_id = ht.id;