[submission] wabt: initial port for the Web Assembly Binary Toolkit

[easye]

A collection of utilities for working with webassembly ("wasm") binaries.

From https://github.com/WebAssembly/wabt:

 WABT (we pronounce it "wabbit") is a suite of tools for WebAssembly, including:

     wat2wasm: translate from WebAssembly text format to the WebAssembly binary format
     wasm2wat: the inverse of wat2wasm, translate from the binary
       format back to the text format (also known as a .wat)
     wasm-objdump: print information about a wasm binary. Similiar to objdump.
     wasm-interp: decode and run a WebAssembly binary file using a stack-based interpreter
     wasm-decompile: decompile a wasm binary into readable C-like syntax.
     wat-desugar: parse .wat text form as supported by the spec
       interpreter (s-expressions, flat syntax, or mixed) and print
       "canonical" flat format
     wasm2c: convert a WebAssembly binary file to a C source and header
     wasm-strip: remove sections of a WebAssembly binary file
     wasm-validate: validate a file in the WebAssembly binary format
     wast2json: convert a file in the wasm spec test format to a JSON file
      and associated wasm binary files
     wasm-stats: output stats for a module
     spectest-interp: read a Spectest JSON file, and run its tests in the interpreter

 These tools are intended for use in (or for development of) toolchains
 or other systems that want to manipulate WebAssembly files. Unlike the
 WebAssembly spec interpreter (which is written to be as simple,
 declarative and "speccy" as possible), they are written in C/C++ and
 designed for easier integration into other systems. Unlike Binaryen
 these tools do not aim to provide an optimization platform or a
 higher-level compiler target; instead they aim for full fidelity and
 compliance with the spec (e.g. 1:1 round-trips with no changes to
 instructions).