Using std::vector<> (and other goodies) in the public API

[toddy (Todd)]

@berk.geveci

We should move away from C++ magic IMO. Too much of that in VTK. Too many macros. Too many tricks to convince the wrappers to do certain things. It makes the C++ API ugly and hard to learn. We should gradually improve the wrappers and start relying on standard C++ containers and algorithms more.

By “magic” I mean the ability to write c->SetContours({10, 20}) where the constructor arg is actually a VTK object type.