(svn r1696) Use GetTileSlope() instead of FindLandscapeHeightByTile() where it is sufficient. FindLandscapeHeightByTile() uses GetTileSlope() internally and adds some more info, which is discarded in these cases.
While touching the code make a bit more clear how GetBridgeHeight() works.

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#ifndef CALLBACK_TABLE_H

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#define CALLBACK_TABLE_H

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extern CommandCallback *_callback_table[];

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extern const int _callback_table_count;

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#endif