Platform Core directory change for introducing components

Hi, I'd like to make the following changes: * Move current code in platform/core/trunk/* to platform/core/trunk/ xwiki-core/*. In the future the goal is that this module is broken down into several other modules. * Create platform/core/trunk/xwiki-plexus: Will hold the classes to bootstrap plexus. * Create platform/core/trunk/xwiki-component: Will hold xwiki classes related to the component architecture. For example: XWiki's ComponentManager and the lifecycle classes (like Initializable for example). These are independent of the underlying component framework used (Plexus, OSGi, etc) I'll do that in the coming few days. Let me know if there's any issue. Thanks -Vincent