Patch all global event handlers

[devappd]

Some event handlers in emscripten are hardcoded to attach to document or window. Here's what needs to be patched to scope to the component:

• keydown/keypress/keyup, JSEvents.registerOrRemoveHandler -- Handles SDL key events in WASM
• keydown/keypress/keyup, Module['keyboardListeningElement'] -- Used by emscripten-core/emscripten/src/library_sdl.js (in Fastcomp backend?)
• keydown/keypress/keyup, emscripten-core/emscripten/src/library_glfw.js
  • Calls window.addEventListener directly