449487: New Extensibility Concept for Scout 

Change-Id: I5f1300fd9a5d4764c1123b34d5d7f81a0bad5cd8
Task-Url: https://bugs.eclipse.org/bugs/show_bug.cgi?id=449487
Reviewed-on: https://git.eclipse.org/r/37937
Reviewed-by: Andi Bur <andi.bur@gmail.com>
Tested-by: Andi Bur <andi.bur@gmail.com>