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- merged all the common stuff from 0,1,2,3 argument versions into one common base class
- removed ReturnType template parameter as it was instantiated with "void" everywhere and the
current ignores the return value of the callbacks anyway
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Replace CallbackHolder, FunctorHolder and SlotHolder with a (smaller) set of polymorphic classes.
SignalHolder now stores a (smart) pointer to the class.
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This is suppose to replace the obsolete Subject/Observer classes.
See the src/tests/testSignals.cc for basic usage.
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