[UI] Adds IntelliJ Context menu

The context menu appears when right-clicking 
on a module. It also adds a dummy Saros menu.

Change-Id: I9b282e7108eb04f99f5752c4761be53764a47e2d
Reviewed-on: http://saros-build.imp.fu-berlin.de/gerrit/1993
Tested-by: Jenkins CI
Reviewed-by: Damla Durmaz <ddurmaz88@gmail.com>
Reviewed-by: Matthias Bohnstedt <matthias.bohnstedt@gmail.com>
Reviewed-by: Holger Schmeisky <google@schmeisky.com>