Add support for inline native methods.

This patch implements the syntax for inline native methods on methodmaps. For example:

```
methodmap Clam {
    public native Clam(a);
    public native ~Clam();
    public native int Size();
}
```

New-style declarations are forced for return values. They will be forced for the arg list and function body later on, after full inline method parsing is available.

This patch is a little gross since I ran out of error numbers, and had to shift up fatal errors from 120.