[INTERNAL] removed CreateProjectTask class

The logic that supports copying of projects has been removed due
accident long ago.

As it is still possible to do this manually because the Wizard for
choosing the project location is non modal this patch now removes the
last artifacts of this broken feature.

Change-Id: I171ee9057beda28d480184a4721217c69fc54b1a
Reviewed-on: http://saros-build.imp.fu-berlin.de/gerrit/1852
Tested-by: Jenkins CI
Reviewed-by: Stefan Rossbach <srossbach@arcor.de>