[runtime] rts serialization additions 1. Increment rts-pingpong model to include more complex data. 2. Add UMLRTInMessage 3. Debug UMLRTObject_class encode/decode/fprintf. 4. Add fields to UMLRTObject_class and UMLRTObject_field 5. Resolve Bug 467789 - missing RTType for long double. 6. Resolve Bug 467787 - segfault when incarnating a capsule with no ports Change-Id: I1a06221ffc6eb87cbcd7037c972d59964bfc25b5 Signed-off-by: Barry Maher <bmaher@gpinc.ca>