NxWM: Add IApplicationFactory so that we can create multiple instances of...

NxWM:  Add IApplicationFactory so that we can create multiple instances of applications; And, as a result of that, re-vamp entire threading model.  this is now buggier than it was before

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@4742 42af7a65-404d-4744-a932-0658087f49c3