Red Box Freeze on "Enter" operation

[Karagy]

Applay "Enter" operation to most objects cause RedBox (as in issue #145) with application Freeze (for short RBF). For attached save it reproducible for me: press 'y', 'u', Enter key (i.e. call "Enter" on self square) - cause RBF; press 'y', 'u', select fountain, Enter key, select fountain or floor - cause RBF.

If needed, I can prepare minidump, as described for issue #145

[RMTEW FULL NAME]

Doing an enter action via the 'y' use menu did not validate the target object type before sending the event, and the script engine would choke when it found that whatever it was the player was trying to enter, was not a portal. Reported by Karagy, with handy save file. Fixes #187

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