Revert "Bug 453181 - Failing unit test IWorkingSetManagerTest.testGetWorkingSets"

This reverts commit b74e671a3c635528084ccacb43032d315740624e.
Revert "Fixed compile warnings"

This reverts commit 2f5e22a4514420ca28923f9e4b6e2a3c6df1b734.
Revert "Bug 427887 - [CommonNavigator] [working sets] Allow working set in Project Navigator to be sorted manually"

This reverts commit 878cb7c3a0088714b33c7e59db55ea9ce05dd5b2.
Revert "Bug 427887: Allow to sort working sets in CNF/Project Explorer"

This reverts commit 4a758782d855203c5181dbd12dfca229cb2d0346.