Array<T> broke build

[hugoam]

The commit that introduced Array<T> (fb20efd) broke the build for compilers that strictly parse templates (gcc, clang...).
The find and replaceWithLast functions use undefined functions nv::find and nv::swap.
The latter can just be replaced with std::swap, and the first, I don't know. These Array functions are dead code anyway so they could be removed altogether.

[jpcy]

Thanks. I need to setup CI so I actually notice when things break.

[hugoam]

Thanks ! Yeah, thanks for adding CI too :)