[pLog-svn] Add the cache control to menu

[Mark Wu]

Hi All:
 
After review the code, it is not easy to replace the current XML menu with
array tree. 
 
So, I try to add the cache to XML menu first.
 
1. The menu cache will cache our core xml menus plus plugins' menus. After
lifetype cache it, the menu will load from cache directly until the cache
expired or deleted.
 
2. If the method works, I will add remove cache in plugins centers.
Therefore, the cache will removed when we add/remove/refresh the plugins
center.
 
If any one of you have time, please kindly test this cached version script,
and let me know if it help performance or not.
 
Regards, Mark
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