DIRECTOR: handle method end statements

[mistydemeo]

This change was suggested by @djsrv. It turns out that methods can have multiple optional end statements, which seem to carry no semantic meaning. One game I was looking at used methods written like:

method name
    # etc
end method

Which was leading to a parse error.

This, alongside #3545, is one of the three fixes needed to get Difficult Book Game/henachoco03 to full working status.

[sev-]

Thank you!