[v0.6.0] Scheme Viewer porgress.

- A mine fuse image has been added.
- That new image, and the dud mine image, now would only show up if the
Object Type is set to "Mines only" or "Both" (if randomly placed mines
are going to be present on the landscape, basically).
[v0.6.0] Fixed the Replay Approving Interface.

This should be the last fix; there was a bug with passworded schemes.