Initial setup of shareing 2.0 sharemanager and share

* Added sharemanager class

This is the central class where all API calls talk to (OCS/Activity).
This in turn talks to the share providers to get the actual sharing
done.

It uses all ShareObjects

* Added share class

Simple class to hold all the share properties that is passed around

* Added IShareProvider interface

Interface that providers os a share have to implement.