REACH-93 Create new Home workspace in nwk

Add a possibility into Flood to clear Home workspace with checking presence of unsaved changes 
[Here's a link to this task](http://adsk-oss.myjetbrains.com/youtrack/issue/REACH-93)

Perhaps ```UnsavedChangesPresentResponse``` or ```HasUnsavedChangesResponse``` might be better names. ```Presence``` is a noun form.