1. do schema processing,
   2. fix threading problem (wait until all threads finished before calling XMLPlatformUtils::Terminate),
   3. handle dom, idom, sax all in one test case
Thus IThreadTest is removed.


git-svn-id: https://svn.apache.org/repos/asf/xerces/c/trunk@173528 13f79535-47bb-0310-9956-ffa450edef68