Retractable Defenses

Adds various defenses that can control movement between spaces.

---Medieval Tech---
Gates require the same amount of work to open and close.

Portcullises require more work to raise but significantly less work to close.

---Industrial Tech---
Submersible Walls added can be made out of any material.

Submersible Walls can only be submerge when the utility console is manned.



GitHub (For non-steam version and source): https://github.com/json-commits/RetractableDefenses



Credits to Mlie for fixing bugs!





Plans to add holographic walls for spacer era tech.