Devlog 1.8-1.9: New modular architecture bits & objects

What's new:

• Added new modular architecture bits & objects.

dosimeter_1
dosimeter_2
dosimeter_3
dosimeter_4
hand_saw_1
key_2
electrical_outlet_1
elevator_buttons_1
hand_rail_1
hand_rail_2
hand_rail_3
platform_1
platform_2
stairs_1
stairs_2
wall_1_plain

• Remodeled and re-textured some of the objects from the early versions.