Fix Walled Shaft mode preview outline having it's x and z flipped at certain rotations.

Build tasks will not be assigned to paste builders until initial scan is completed to ensure full detection of rack rail areas.

- Add new Walled Shaft build mode to dig or decorate existing shafts with a set wall decor.
- Final re-scan will now be done when less than 50 pending tasks remain to obtain new tasks due to terrain changes over lengthy builds.

Fix for assignment hold when less than 50 tasks.

Reduce minimum height to 3 for terraforming.

Fix to prevent removing of scrap minecart track.

Fix to prevent removing of minecart track and non-transport pipe types.

Change to keep Unity updates stopping on site marker visuals when editing settings and not facing the machine.

- Organic rock is no longer dug.
- Fix another edge case for stuck drone outside working range.

Logistics and energy grommets are not longer removed as decor.