Handy macros for callbacks.
Instead of:
std::bind(func_ptr, instnace, std::placeholder::_1)
you use:
CALLBACK_1(func_ptr, instance)
And also removes more warnings from the tests
Some CCLog message contained trailing newlines which
made the logs hard to read on many platforms. The solution
here is to stip trailing newlines on those platforms, and also
to remove the newlines from the existing log messages.