Replace wabt::*vector with std::vector (#366)

This propagates through a lot of code since std::vector will call
constructors and destructors. In particular, this CL adds many default
constructors and destructors to previously POD types. Many of them are
only there to construct `Var` and `StringSlice` types, so they likely
can be removed when those have their own constructors.

Since unions members cannot contain constructors or destructors
(without additional implementation), this CL changes those members to
pointers instead. (Perhaps in a future CL these will be std::variant
instead of union, so the members can be value types again.)

0 files changed, 0 insertions, 0 deletions