Always look up services through Framework.getService instead of using explicit runtime components

There are still a number of places where we look up services through code like:

return (LifeCycleService) Framework.getRuntime().getComponent(LifeCycleServiceImpl.NAME);

All these calls should be replaced by proper service lookup through Framework.getService().

In addition this avoids a synchronization issue on getComponent.

This applies to:

• ActionService
• CommentService
• DirectoryTreeService
• DocumentsListsService
• DublinCoreStorageService
• LifeCycleService
• MimetypeRegistryService
• NXAuditEventsService
• NotificationService
• PluggableAuthenticationService
• PluggableRestletService
• RelationService
• RepositoryService
• SecurityService
• SegmentIOComponent
• TrashManagementService
• UIPermissionService
• UserWorkspaceService
• WebDavService