- More minor fixes and tweaks in the wake of the recent changes in the DEV build.

Known issue: objects you've placed in the editor will be on odd altitudes when previewing the mission.

- a temporary fix applied to reflect the recent game update. Proper patch coming in the next few days.

- The height editing and object handling was totally broken on some maps due to rounding errors.
- Playtesting the mission in the editor didn't always change the height map.
- Mod erased all map edits unexpectedly.