Also bump its helper crates (js-sys, wasm-bindgen-futures) to the
latest versions, except for web-sys which seems to be locked by wgpu
to one version before the latest (0.3.50).
* Remove `buildProduction` as it was equivalent to `build`.
* Fix `build:avm_debug` and change it to `build:debug`, which also
disables Webpack optimizations.