[INTERNAL] added TODOs for Saros Core move/refactor

Added them as Java classes to prevent other developers from simply
moving a complete package with all affected classes into the core.

The README classes contains a description why the package name should be
changed when moving those classes to the Saros Core.


Change-Id: Ia4862b56948ac6c8b3c6120ad35cfe0945e804ac
Reviewed-on: http://saros-build.imp.fu-berlin.de/gerrit/1443
Tested-by: Jenkins CI
Reviewed-by: Stefan Rossbach <srossbach@arcor.de>