Adding = operator for TTErr
Adding getObserversCount method
Making TTList getSize() as a const method
Adding/Removing observers before to enable/disable listening
Checking if there is still observers before to disable listening
enable the listening only one time for the first observer
Renaming getObserversCount into get ObserverCount
Merge branch 'dev' of https://github.com/jamoma/JamomaCore into feature/cmake