Serialization now adheres to new VAB serialization scheme.

 - Removed support for set container types from basyx::object
 - Reworked JSON serialization and removed edge cases
 - Adjusted implementation of to use list_t instead submodel::LangStringSet
 - Adjusted test cases

Change-Id: I3e3ab33f74539dbd01b323ea310cf58cad3052ff
Signed-off-by: Thomas Psota <thomas.psota@iese.fraunhofer.de>
12 files changed