Free Hero Mesh

* Win conditions: You cannot currently define them in their own block;
you must use the WinLevel command. (In future, a separate block to allow
defining winning conditions like PuzzleScript might be implemented, but
currently it is not implemented.)

Also, some of the features listed in the GitHub issue tracker for
PuzzleScript and PuzzleScript+ are already implemented in Free Hero Mesh,
although some are planned to be implemented, are unnecessary (for whatever
reasons), or are deliberately not implemented. There are also many features
that PuzzleScript does not have.
although some are planned to be implemented, or are unnecessary (for
whatever reasons), or are deliberately not implemented. There are also many
features that PuzzleScript does not have.

Certainly further improvements are also possible, too.