* missing exports for new classes
* public non virtual convertToQString, propertyByIndex
* removed left-over of watchdog
* virtual destructor for avionicsbase.h
bypassing the old Policy::MetaType classes. The ultimate intention is to decompose all the aspects of
CValueObject into separate mixins in this manner, and have derived classes inherit from the mixins directly.
Splitting the responsibilities of CValueObject into separate classes will reduce the coupling between different
cross-cutting concerns and allow us to untangle the web of interdependencies and greatly simplify things.
* Involves rearranging some header includes to break cyclic include dependencies,
* Adding a new, simple base class CEmpty,
* Removing any remaining polymorphic uses of CValueObject with templates,
* Adding a new trait for use with enable_if to restrict templates to work only with value objects,
* Replacing the polymorphic/runtime multimethod-based compare functions with static/compile-time compare functions.