Replace FINAL_11 with final.

The changes to OpenSim/Wrapping/SWIGSimTK/common.h should be discussed. See some discussion over at simbody [here](https://github.com/simbody/simbody/pull/302/files#diff-ba43f68612864196b99e9cd542e95b73L239). This common.h file in simbody was just updated by @sherm1.


foops: :+1: 

Yes, I understand that behavior. But the problem there is that one should not use the word `virtual` when overriding. And if you don't say `virtual` then `final` and `override` do the same thing. And if you're saying the person will make the mistake of using `virtual` there (which I agree they will), then I don't think we can also depend on them to use `override` as well.