This commit continues previous work and also #708 by removing the need to use `HostRef<Module>` in the API of the `wasmtime` crate. The API changes performed here are: * The `Module` type is now itself internally reference counted. * The `Module::store` function now returns the `Store` that was used to create a `Module` * Documentation for `Module` and its methods have been expanded.
This is the test-programs crate, which builds and runs whole programs
compiled to wasm32-wasi.