Inner function should be pre-interpreted in all of call-scopes (v1.2)

Curernt ReoScript does not pre-interpret the inner functions which defined inside another function scope. Function call before its definition currently is not available.

```
function outer() {
  inner();           // error: Function is not defined: inner

  function inner() {
    console.log('inner called');
  };
};

outer();
```

This issue is planned to be solved in next release.
