Final refactoring and implementation of delayed window deletion logic. Works...

Final refactoring and implementation of delayed window deletion logic.  Works worse now, but the changes are important and need to be checked in now

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@4747 42af7a65-404d-4744-a932-0658087f49c3