org.eclipse.pde.spy.preferences

preference spy should also be usable in e4 RCP applications, therefore
we should remove the IDE depencency.


Change-Id: Ifb34ddf1819ad72a0b64399a2ac2047c5534dfe5
Signed-off-by: Lars Vogel <Lars.Vogel@vogella.com>
Reviewed-on: https://git.eclipse.org/r/c/pde/eclipse.pde.ui/+/187270
Tested-by: PDE Bot <pde-bot@eclipse.org>