[wasm] go-interpreter/wagon & wasm-modules with native (Go) functions

<p>with this PR <a href="https://github.com/go-interpreter/wagon/pull/58">https://github.com/go-interpreter/wagon/pull/58</a> merged into <code>wagon</code>, there&#39;s support for wasm modules containing native Go functions. Thanks Guillaume!</p> <p>This opens the path for having a pure-Go (sans nodejs) support for wasm modules created by (to be) Go-1.11 (that currently relies on some nodejs functions for interacting with the system).</p> <ul> <li><a href="https://github.com/go-interpreter/wagon/blob/master/exec/call_test.go#L15">https://github.com/go-interpreter/wagon/blob/master/exec/call_test.go#L15</a></li> <li><a href="https://github.com/go-interpreter/wagon/blob/master/exec/call_test.go#L139">https://github.com/go-interpreter/wagon/blob/master/exec/call_test.go#L139</a></li> </ul> <hr/>**评论：**<br/><br/>shadowh511: <pre><p>I&#39;ve been trying to use this for a while and I&#39;ve been completely unlucky getting a function that has arguments to work. Has anyone here gotten functions with arguments to work?</p></pre>sbinet: <pre><p>The second link shows a test that calls a host function with an argument (add3).</p> <p>What did you do? And what was the (unexpected) result?</p></pre>