WIP: web-sys output support

[sdobz]

Missing:

• Proper EventListenerHandle
• Majority of events (whoops, I'll get to that)

Issues:
web-sys example wasm is built, I see error in firefox when I try to run:

Error loading Rust wasm module 'typed_html_web_sys_test': TypeError: "import object field '__wbindgen_placeholder__' is not an Object" typed-html-web-sys-test.js:46:21
TypeError: import object field '__wbindgen_placeholder__' is not an Object

Aside: The code of conduct references immutable.rs, I don't think this is intentional

[sdobz]

cargo web does not support wasm-bindgen/web-sys at this time, so I've moved it over to use wasm-bindgen and no-module js loading.

Current status: dom loads and displays, events fail to execute (though they appear to be binding)

[dbrgn]

@sdobz any news on web-sys support? 🙂 I'm also interested in this.