Fix emscripten demo and libwabt.js (#407)

This removes the more complicated emscripten wrapper we used before, in
favor of something that is much simpler.

* Remove the memory init file
* Remove the onInputKey handling in the demo so it doesn't auto-indent
  (it was broken now that we have the flat syntax)
* Simplify emscripten-helpers to provide very simple C-function wrappers
  around the wast2wasm API:

  * wabt_parse_ast
  * wabt_resolve_names_script
  * wabt_validate_script
  * wabt_write_binary_module

  The tricky part is that some functions return multiple values, so
  those are returned as structs as well:

  * WabtParseAstResult
  * WabtWriteBinaryModuleResult

0 files changed, 0 insertions, 0 deletions