[Owncloud] Missing methods in public namespace

[Thomas Tanghus]

I'm trying to collect what we need to get in the public namespace, and the 
ones listed below are what I've found so far, and my suggestion for placement, 
or questions on the same:

OC_App:
 - getAppWebPath -> OCP\App
   Needed for remote.php in Calendar and Contacts.
 - loadApps -> OCP\App
   Needed for remote.php in Calendar and Contacts.

OC_Search_*:
 - I would suggest an interface for the providers, but there's some work going   
on in https://github.com/owncloud/core/pull/4553 and I'm not sure of the plan?

OC_Filesystem:
 - file_get_contents/file_put_contents -> OCP\Files

OC_FileProxy:
 - $enabled
   Needed when reading and writing to storage obtained with
   \OCP\Files::getStorage('appName') when encryption is enabled.
   Maybe this can be done in the getStorage() call?

OC_Cache:
 - get/set/hasKey/remove -> OCP\Cache

Please add what I haven't mentioned.

-- 
Med venlig hilsen / Best Regards

Thomas Tanghus