Modifies serialization for new VAB serialization schema

- removes set/list differentiation from JSON serialization
- container type in meta-model interfaces support Collections instead of List/Set
- fixes empty list return values in connected operations
- adjusts test cases

Change-Id: I1e85aa63eec5a20360725a3caaf00f92d4972c1c
Signed-off-by: Daniel Espen <daniel.espen@iese.fraunhofer.de>
57 files changed