TBB as new dependency

[Klaim - Joël Lamotte]

I think I will have to add TBB ( http://threadingbuildingblocks.org ) as dependency of 
AOS Designer's backend.

I can't find any other usable concurrent containers, in particular associative containers.

(also I have some experience with it so it should be fast to setup)

I could implement one with mutexes though, it would not scale but would be a short-term solution

meant to be replaced. But as tbb is already there, it might be wiser to just use it.

Any comment on this?

Joel Lamotte