SAVER: wander straight until blocked, and fix the edge-freeze

- Drop the occasional junction turn: keep the current heading until it is
  actually blocked, then turn onto a random non-U-turn direction.
- Fix a freeze: a map's far edge (maxY/maxX = wCurrentMap*2 - 1) is always odd,
  but scroll moves round down to even coords, so the camera stops one coord short
  and 'coord != max' never flagged the edge as blocked -> the wander got stuck
  clamping forever. SlopValidDirMask now treats a direction as open only if there
  are >= 2 coords of room (one even step) or a connection to cross.

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