Add a std::make_unique implementation (newstd::make_unique).

Some compilers we care about (mostly g++) do not support std::make_unique yet,
but we still want to use it in our codebase to make unique_ptr code more
readable. This commit introduces an implementation derivated from the libc++
code in the Dolphin codebase so we can use it right now everywhere.
Use newstd::make_unique where it makes sense to (and improve some other unique_ptr initializations).
[squashme] make_unique: s/newstd/std/
[squashme] GameListCtrl: s/newstd/std/