Change the behaviour of insp in windows to keep its window open, with some status...

Change the behaviour of insp in windows to keep its window open, with some status text in the title bar. It also clears the screen now on startup, see the wrapper for what a nasty amount of code it is to do such a simple thing to a windows console :(
Also, add somewhat of a hack to cut down on allocation time taken to map windows fd to a posix style fd in iocp engine.

git-svn-id: http://svn.inspircd.org/repository/trunk/inspircd@7217 e03df62e-2008-0410-955e-edbf42e46eb7