[ros-svn] [arty] 20127: Working work item library.

[arty at svn.reactos.com]

Working work item library.
- Slightly changed semantics of ChewCreate: the work may be performed 
  inline if we're in the right irql already.
- The user data is copied automatically if the call succeeds and a work 
  item is created.
- The address of the work item is returned through an argument if it
  was allocated.



Updated files:
trunk/reactos/drivers/lib/chew/workqueue.c
trunk/reactos/include/chew/chew.h